I have spent hours on this and checked every bit of the configuration files. I have also carefully compared my files against the tutorial here https://www.linode.com/docs/email/postf ... -and-mysql

I can send emails without a problem but incoming emails are stuck at a step. Interesting thing is the mails do not get bounced. Sender does not receive an error message. Mail somehow gets lost just before it is saved to Inbox. I am copying the mail log below (activated verbose logging). It looks like the problem is related to the missing dovecot-lmtp file.

Main attraction is the line towards the end (added space for visibility). I have also replaced personally identifiable information.

Thanks for the help!

Aug 15 07:18:54 hostname postfix/smtpd[4442]: name_mask: all
Aug 15 07:18:54 hostname postfix/smtpd[4442]: inet_addr_local: configured 2 IPv4 addresses
Aug 15 07:18:54 hostname postfix/smtpd[4442]: inet_addr_local: configured 3 IPv6 addresses
Aug 15 07:18:54 hostname postfix/smtpd[4442]: process generation: 6 (6)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: mynetworks ~? debug_peer_list
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: mynetworks ~? fast_flush_domains
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: mynetworks ~? mynetworks
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: relay_domains ~? debug_peer_list
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: relay_domains ~? fast_flush_domains
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: relay_domains ~? mynetworks
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: relay_domains ~? permit_mx_backup_networks
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: relay_domains ~? qmqpd_authorized_clients
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: relay_domains ~? relay_domains
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: permit_mx_backup_networks ~? debug_peer_list
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: permit_mx_backup_networks ~? fast_flush_domains
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: permit_mx_backup_networks ~? mynetworks
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: permit_mx_backup_networks ~? permit_mx_backup_networks
Aug 15 07:18:54 hostname postfix/smtpd[4442]: connect to subsystem private/proxymap
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr request = open
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr table = unix:passwd.byname
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr flags = 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/proxymap socket: wanted attribute: status
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: status
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/proxymap socket: wanted attribute: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 16
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/proxymap socket: wanted attribute: (list terminator)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_proxy_open: connect to map=unix:passwd.byname status=0 server_flags=fixed
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_open: proxy:unix:passwd.byname
Aug 15 07:18:54 hostname postfix/smtpd[4442]: Compiled against Berkeley DB: 5.3.28?
Aug 15 07:18:54 hostname postfix/smtpd[4442]: Run-time linked against Berkeley DB: 5.3.28?
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_open: hash:/etc/aliases
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: user = mailuser
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: password = Cefah!05B!sH3r
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: dbname = mailserver
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: result_format = %s
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: option_file = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: option_group = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: tls_key_file = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: tls_cert_file = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: tls_CAfile = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: tls_CApath = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: tls_ciphers = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_bool: /etc/postfix/mysql-virtual-alias-maps.cf: tls_verify_cert = on
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_int: /etc/postfix/mysql-virtual-alias-maps.cf: expansion_limit = 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: query = SELECT destination FROM virtual_aliases WHERE source='%s'
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: domain = 
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-alias-maps.cf: hosts = 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_open: mysql:/etc/postfix/mysql-virtual-alias-maps.cf
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: user = mailuser
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: password = Cefah!05B!sH3r
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: dbname = mailserver
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: result_format = %s
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: option_file = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: option_group = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: tls_key_file = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: tls_cert_file = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: tls_CAfile = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: tls_CApath = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: tls_ciphers = <NULL>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_bool: /etc/postfix/mysql-virtual-mailbox-maps.cf: tls_verify_cert = on
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_int: /etc/postfix/mysql-virtual-mailbox-maps.cf: expansion_limit = 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: query = SELECT 1 FROM virtual_users WHERE email='%s'
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: domain = 
Aug 15 07:18:54 hostname postfix/smtpd[4442]: cfg_get_str: /etc/postfix/mysql-virtual-mailbox-maps.cf: hosts = 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_open: mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: smtpd_access_maps ~? debug_peer_list
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: smtpd_access_maps ~? fast_flush_domains
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: smtpd_access_maps ~? mynetworks
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: smtpd_access_maps ~? permit_mx_backup_networks
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: smtpd_access_maps ~? qmqpd_authorized_clients
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: smtpd_access_maps ~? relay_domains
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: smtpd_access_maps ~? smtpd_access_maps
Aug 15 07:18:54 hostname postfix/smtpd[4442]: unknown_helo_hostname_tempfail_action = defer_if_permit
Aug 15 07:18:54 hostname postfix/smtpd[4442]: unknown_address_tempfail_action = defer_if_permit
Aug 15 07:18:54 hostname postfix/smtpd[4442]: unverified_recipient_tempfail_action = defer_if_permit
Aug 15 07:18:54 hostname postfix/smtpd[4442]: unverified_sender_tempfail_action = defer_if_permit
Aug 15 07:18:54 hostname postfix/smtpd[4442]: name_mask: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: auto_clnt_create: transport=local endpoint=private/tlsmgr
Aug 15 07:18:54 hostname postfix/smtpd[4442]: auto_clnt_open: connected to private/tlsmgr
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr request = seed
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr size = 32
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/tlsmgr: wanted attribute: status
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: status
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/tlsmgr: wanted attribute: seed
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: seed
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: GjZB+XQ0k0gc1iakM/YAT6gVZMVZwiKI9nKS8YKPqgk=
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/tlsmgr: wanted attribute: (list terminator)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr request = policy
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr cache_type = smtpd
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/tlsmgr: wanted attribute: status
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: status
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/tlsmgr: wanted attribute: cachable
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: cachable
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/tlsmgr: wanted attribute: timeout
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: timeout
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 3600
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/tlsmgr: wanted attribute: (list terminator)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: fast_flush_domains ~? debug_peer_list
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_string: fast_flush_domains ~? fast_flush_domains
Aug 15 07:18:54 hostname postfix/smtpd[4442]: auto_clnt_create: transport=local endpoint=private/anvil
Aug 15 07:18:54 hostname postfix/smtpd[4442]: connection established
Aug 15 07:18:54 hostname postfix/smtpd[4442]: master_notify: status 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: name_mask: resource
Aug 15 07:18:54 hostname postfix/smtpd[4442]: name_mask: software
Aug 15 07:18:54 hostname postfix/smtpd[4442]: connect from mail-io0-f182.google.com[297.35.233.145]
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: mail-io0-f182.google.com: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: 297.35.233.145: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: mail-io0-f182.google.com: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: 297.35.233.145: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: smtp_stream_setup: maxtime=300 enable_deadline=0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? 127.0.0.0/8
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? 127.0.0.0/8
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? [::ffff:127.0.0.0]/104
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? [::ffff:127.0.0.0]/104
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? [::1]/128
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? [::1]/128
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: mail-io0-f182.google.com: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: 297.35.233.145: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: auto_clnt_open: connected to private/anvil
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr request = connect
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr ident = smtp:297.35.233.145
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/anvil: wanted attribute: status
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: status
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/anvil: wanted attribute: count
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: count
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/anvil: wanted attribute: rate
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: rate
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/anvil: wanted attribute: (list terminator)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 220 hostname.domain.com ESMTP Postfix (Ubuntu)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: < mail-io0-f182.google.com[297.35.233.145]: EHLO mail-io0-f182.google.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: mail-io0-f182.google.com: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: 297.35.233.145: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-hostname.domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-PIPELINING
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-SIZE 10240000
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-VRFY
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-ETRN
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-STARTTLS
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-ENHANCEDSTATUSCODES
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-8BITMIME
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250 DSN
Aug 15 07:18:54 hostname postfix/smtpd[4442]: < mail-io0-f182.google.com[297.35.233.145]: STARTTLS
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 220 2.0.0 Ready to start TLS
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr request = seed
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr size = 32
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/tlsmgr: wanted attribute: status
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: status
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/tlsmgr: wanted attribute: seed
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: seed
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: bJZzUezTWMbv/Utpr4zxePMiTAtILvWqU1mRgW6LOJs=
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/tlsmgr: wanted attribute: (list terminator)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: xsasl_dovecot_server_create: SASL service=smtp, realm=(null)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: name_mask: noanonymous
Aug 15 07:18:54 hostname postfix/smtpd[4442]: xsasl_dovecot_server_connect: Connecting
Aug 15 07:18:54 hostname postfix/smtpd[4442]: xsasl_dovecot_server_connect: auth reply: VERSION?1?1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: xsasl_dovecot_server_connect: auth reply: MECH?PLAIN?plaintext
Aug 15 07:18:54 hostname postfix/smtpd[4442]: name_mask: plaintext
Aug 15 07:18:54 hostname postfix/smtpd[4442]: xsasl_dovecot_server_connect: auth reply: MECH?LOGIN?plaintext
Aug 15 07:18:54 hostname postfix/smtpd[4442]: name_mask: plaintext
Aug 15 07:18:54 hostname postfix/smtpd[4442]: xsasl_dovecot_server_connect: auth reply: SPID?4259
Aug 15 07:18:54 hostname postfix/smtpd[4442]: xsasl_dovecot_server_connect: auth reply: CUID?2
Aug 15 07:18:54 hostname postfix/smtpd[4442]: xsasl_dovecot_server_connect: auth reply: COOKIE?8e62d916fdb6f0371a41a823198817f5
Aug 15 07:18:54 hostname postfix/smtpd[4442]: xsasl_dovecot_server_connect: auth reply: DONE
Aug 15 07:18:54 hostname postfix/smtpd[4442]: xsasl_dovecot_server_mech_filter: keep mechanism: PLAIN
Aug 15 07:18:54 hostname postfix/smtpd[4442]: xsasl_dovecot_server_mech_filter: keep mechanism: LOGIN
Aug 15 07:18:54 hostname postfix/smtpd[4442]: < mail-io0-f182.google.com[297.35.233.145]: EHLO mail-io0-f182.google.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: mail-io0-f182.google.com: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: 297.35.233.145: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-hostname.domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-PIPELINING
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-SIZE 10240000
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-VRFY
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-ETRN
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-AUTH PLAIN LOGIN
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-ENHANCEDSTATUSCODES
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250-8BITMIME
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250 DSN
Aug 15 07:18:54 hostname postfix/smtpd[4442]: < mail-io0-f182.google.com[297.35.233.145]: MAIL FROM:<somesender@gmail.com> SIZE=2297
Aug 15 07:18:54 hostname postfix/smtpd[4442]: extract_addr: input: <somesender@gmail.com>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: smtpd_check_addr: addr=somesender@gmail.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: connect to subsystem private/rewrite
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr request = rewrite
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr rule = local
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr address = somesender@gmail.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: address
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: address
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: somesender@gmail.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: (list terminator)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: rewrite_clnt: local: somesender@gmail.com -> somesender@gmail.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr request = resolve
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr sender = 
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr address = somesender@gmail.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: transport
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: transport
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: smtp
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: nexthop
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: nexthop
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: gmail.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: recipient
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: recipient
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: somesender@gmail.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 4096
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: (list terminator)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: resolve_clnt: `' -> `somesender@gmail.com' -> transp=`smtp' host=`gmail.com' rcpt=`somesender@gmail.com' flags= class=default
Aug 15 07:18:54 hostname postfix/smtpd[4442]: ctable_locate: install entry key somesender@gmail.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: extract_addr: in: <somesender@gmail.com>, result: somesender@gmail.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr request = rewrite
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr rule = local
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr address = double-bounce
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: address
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: address
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: double-bounce@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: (list terminator)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: rewrite_clnt: local: double-bounce -> double-bounce@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: smtpd_check_rewrite: trying: permit_inet_interfaces
Aug 15 07:18:54 hostname postfix/smtpd[4442]: permit_inet_interfaces: mail-io0-f182.google.com 297.35.233.145
Aug 15 07:18:54 hostname postfix/smtpd[4442]: fsspace: .: block size 4096, blocks free 5817531
Aug 15 07:18:54 hostname postfix/smtpd[4442]: smtpd_check_queue: blocks 4096 avail 5817531 min_free 0 msg_size_limit 10240000
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250 2.1.0 Ok
Aug 15 07:18:54 hostname postfix/smtpd[4442]: < mail-io0-f182.google.com[297.35.233.145]: RCPT TO:<email@domain.com>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: extract_addr: input: <email@domain.com>
Aug 15 07:18:54 hostname postfix/smtpd[4442]: smtpd_check_addr: addr=email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr request = rewrite
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr rule = local
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr address = email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: address
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: address
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: (list terminator)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: rewrite_clnt: local: email@domain.com -> email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr request = resolve
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr sender = 
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr address = email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: transport
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: transport
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: lmtp
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: nexthop
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: nexthop
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: unix:private/dovecot-lmtp
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: recipient
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: recipient
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: flags
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: 1024
Aug 15 07:18:54 hostname postfix/smtpd[4442]: private/rewrite socket: wanted attribute: (list terminator)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: resolve_clnt: `' -> `email@domain.com' -> transp=`lmtp' host=`unix:private/dovecot-lmtp' rcpt=`email@domain.com' flags= class=virtual
Aug 15 07:18:54 hostname postfix/smtpd[4442]: ctable_locate: install entry key email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: extract_addr: in: <email@domain.com>, result: email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: >>> START Recipient address RESTRICTIONS <<<
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=permit_mynetworks
Aug 15 07:18:54 hostname postfix/smtpd[4442]: permit_mynetworks: mail-io0-f182.google.com 297.35.233.145
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? 127.0.0.0/8
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? 127.0.0.0/8
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? [::ffff:127.0.0.0]/104
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? [::ffff:127.0.0.0]/104
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? [::1]/128
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? [::1]/128
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: mail-io0-f182.google.com: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: 297.35.233.145: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=permit_mynetworks status=0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=permit_sasl_authenticated
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=permit_sasl_authenticated status=0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=defer_unauth_destination
Aug 15 07:18:54 hostname postfix/smtpd[4442]: reject_unauth_destination: email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: permit_auth_destination: email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: ctable_locate: leave existing entry key email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=defer_unauth_destination status=0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: >>> END Recipient address RESTRICTIONS <<<
Aug 15 07:18:54 hostname postfix/smtpd[4442]: >>> START Recipient address RESTRICTIONS <<<
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=permit_sasl_authenticated
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=permit_sasl_authenticated status=0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=permit_mynetworks
Aug 15 07:18:54 hostname postfix/smtpd[4442]: permit_mynetworks: mail-io0-f182.google.com 297.35.233.145
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? 127.0.0.0/8
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? 127.0.0.0/8
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? [::ffff:127.0.0.0]/104
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? [::ffff:127.0.0.0]/104
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? [::1]/128
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? [::1]/128
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: mail-io0-f182.google.com: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: match_list_match: 297.35.233.145: no match
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=permit_mynetworks status=0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=reject_unauth_destination
Aug 15 07:18:54 hostname postfix/smtpd[4442]: reject_unauth_destination: email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: permit_auth_destination: email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: ctable_locate: leave existing entry key email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: generic_checks: name=reject_unauth_destination status=0
Aug 15 07:18:54 hostname postfix/smtpd[4442]: >>> END Recipient address RESTRICTIONS <<<
Aug 15 07:18:54 hostname postfix/smtpd[4442]: >>> CHECKING RECIPIENT MAPS <<<
Aug 15 07:18:54 hostname postfix/smtpd[4442]: ctable_locate: leave existing entry key email@domain.com
Aug 15 07:18:54 hostname postfix/smtpd[4442]: maps_find: recipient_canonical_maps: email@domain.com: not found
Aug 15 07:18:54 hostname postfix/smtpd[4442]: maps_find: recipient_canonical_maps: user: not found
Aug 15 07:18:54 hostname postfix/smtpd[4442]: maps_find: recipient_canonical_maps: @domain.com: not found
Aug 15 07:18:54 hostname postfix/smtpd[4442]: mail_addr_find: email@domain.com -> (not found)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: maps_find: canonical_maps: email@domain.com: not found
Aug 15 07:18:54 hostname postfix/smtpd[4442]: maps_find: canonical_maps: user: not found
Aug 15 07:18:54 hostname postfix/smtpd[4442]: maps_find: canonical_maps: @domain.com: not found
Aug 15 07:18:54 hostname postfix/smtpd[4442]: mail_addr_find: email@domain.com -> (not found)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql_get_active: attempting to connect to host 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql: successful connection to host 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql: successful query from host 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql_lookup: retrieved 0 rows
Aug 15 07:18:54 hostname postfix/smtpd[4442]: maps_find: virtual_alias_maps: email@domain.com: not found
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql_get_active: found active connection to host 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql: successful query from host 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql_lookup: retrieved 0 rows
Aug 15 07:18:54 hostname postfix/smtpd[4442]: maps_find: virtual_alias_maps: user: not found
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql_get_active: found active connection to host 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql: successful query from host 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql_lookup: retrieved 0 rows
Aug 15 07:18:54 hostname postfix/smtpd[4442]: maps_find: virtual_alias_maps: @domain.com: not found
Aug 15 07:18:54 hostname postfix/smtpd[4442]: mail_addr_find: email@domain.com -> (not found)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql_get_active: attempting to connect to host 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql: successful connection to host 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql: successful query from host 127.0.0.1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: dict_mysql_lookup: retrieved 1 rows
Aug 15 07:18:54 hostname postfix/smtpd[4442]: maps_find: virtual_mailbox_maps: mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf(0,lock|fold_fix): email@domain.com = 1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: mail_addr_find: email@domain.com -> 1
Aug 15 07:18:54 hostname postfix/smtpd[4442]: before input_transp_cleanup: cleanup flags = enable_header_body_filter enable_automatic_bcc enable_address_mapping enable_milters
Aug 15 07:18:54 hostname postfix/smtpd[4442]: after input_transp_cleanup: cleanup flags = enable_header_body_filter enable_automatic_bcc enable_address_mapping
Aug 15 07:18:54 hostname postfix/smtpd[4442]: connect to subsystem public/cleanup
Aug 15 07:18:54 hostname postfix/smtpd[4442]: public/cleanup socket: wanted attribute: queue_id
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: queue_id
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute value: ECCB51412C
Aug 15 07:18:54 hostname postfix/smtpd[4442]: public/cleanup socket: wanted attribute: (list terminator)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:54 hostname postfix/smtpd[4442]: send attr flags = 178
Aug 15 07:18:54 hostname postfix/smtpd[4442]: ECCB51412C: client=mail-io0-f182.google.com[297.35.233.145]
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250 2.1.5 Ok
Aug 15 07:18:54 hostname postfix/smtpd[4442]: < mail-io0-f182.google.com[297.35.233.145]: DATA
Aug 15 07:18:54 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 354 End data with <CR><LF>.<CR><LF>
Aug 15 07:18:55 hostname postfix/cleanup[4447]: ECCB51412C: message-id=<55CF201E.8080807@gmail.com>
Aug 15 07:18:55 hostname postfix/qmgr[4437]: ECCB51412C: from=<somesender@gmail.com>, size=2457, nrcpt=1 (queue active)
Aug 15 07:18:55 hostname postfix/smtpd[4442]: public/cleanup socket: wanted attribute: status
Aug 15 07:18:55 hostname postfix/smtpd[4442]: input attribute name: status
Aug 15 07:18:55 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:55 hostname postfix/smtpd[4442]: public/cleanup socket: wanted attribute: reason
Aug 15 07:18:55 hostname postfix/smtpd[4442]: input attribute name: reason
Aug 15 07:18:55 hostname postfix/smtpd[4442]: input attribute value: (end)
Aug 15 07:18:55 hostname postfix/smtpd[4442]: public/cleanup socket: wanted attribute: (list terminator)
Aug 15 07:18:55 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:55 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 250 2.0.0 Ok: queued as ECCB51412C








Aug 15 07:18:55 hostname postfix/lmtp[4440]: ECCB51412C: to=<email@domain.com>, relay=none, delay=0.1, delays=0.1/0/0/0, dsn=4.4.1, status=deferred (connect to hostname.domain.com[private/dovecot-lmtp]: No such file or directory)






Aug 15 07:18:55 hostname postfix/smtpd[4442]: < mail-io0-f182.google.com[297.35.233.145]: QUIT
Aug 15 07:18:55 hostname postfix/smtpd[4442]: > mail-io0-f182.google.com[297.35.233.145]: 221 2.0.0 Bye
Aug 15 07:18:55 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? 127.0.0.0/8
Aug 15 07:18:55 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? 127.0.0.0/8
Aug 15 07:18:55 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? [::ffff:127.0.0.0]/104
Aug 15 07:18:55 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? [::ffff:127.0.0.0]/104
Aug 15 07:18:55 hostname postfix/smtpd[4442]: match_hostname: mail-io0-f182.google.com ~? [::1]/128
Aug 15 07:18:55 hostname postfix/smtpd[4442]: match_hostaddr: 297.35.233.145 ~? [::1]/128
Aug 15 07:18:55 hostname postfix/smtpd[4442]: match_list_match: mail-io0-f182.google.com: no match
Aug 15 07:18:55 hostname postfix/smtpd[4442]: match_list_match: 297.35.233.145: no match
Aug 15 07:18:55 hostname postfix/smtpd[4442]: send attr request = disconnect
Aug 15 07:18:55 hostname postfix/smtpd[4442]: send attr ident = smtp:297.35.233.145
Aug 15 07:18:55 hostname postfix/smtpd[4442]: private/anvil: wanted attribute: status
Aug 15 07:18:55 hostname postfix/smtpd[4442]: input attribute name: status
Aug 15 07:18:55 hostname postfix/smtpd[4442]: input attribute value: 0
Aug 15 07:18:55 hostname postfix/smtpd[4442]: private/anvil: wanted attribute: (list terminator)
Aug 15 07:18:55 hostname postfix/smtpd[4442]: input attribute name: (end)
Aug 15 07:18:55 hostname postfix/smtpd[4442]: disconnect from mail-io0-f182.google.com[297.35.233.145]
Aug 15 07:18:55 hostname postfix/smtpd[4442]: master_notify: status 1
Aug 15 07:18:55 hostname postfix/smtpd[4442]: connection closed
Aug 15 07:18:59 hostname postfix/smtpd[4442]: proxymap stream disconnect
Aug 15 07:18:59 hostname postfix/smtpd[4442]: auto_clnt_close: disconnect private/tlsmgr stream
Aug 15 07:18:59 hostname postfix/smtpd[4442]: rewrite stream disconnect

Below is the mail log after restarting both of the services:

Aug 15 07:46:24 hostname postfix/master[4433]: terminating on signal 15
Aug 15 07:46:24 hostname postfix/master[4658]: daemon started -- version 2.11.0, configuration /etc/postfix
Aug 15 07:46:33 hostname dovecot: ssl-params: Warning: Killed with signal 15 (by pid=1 uid=0 code=kill)
Aug 15 07:46:33 hostname dovecot: log: Warning: Killed with signal 15 (by pid=1 uid=0 code=kill)
Aug 15 07:46:33 hostname dovecot: master: Warning: Killed with signal 15 (by pid=1 uid=0 code=kill)
Aug 15 07:46:33 hostname dovecot: master: Dovecot v2.2.9 starting up (core dumps disabled)

There appears to be a problem with your Dovecot configuration. Look at the Linode guide again and make sure you have followed the part about the service lmtp section correctly. Restart Dovecot so the new configuration is applied.

You will probably find that the mail is not lost, but is still in the Postfix queue waiting to be delivered.

That is correct. Mails is queued.

However, I have triple checked that my Dovecot config matches the Linode guide to the letter. Everything is in order but for some reason it is still not working.

Any other thoughts?

Can you verify whether the below code snippet is accurate? Description says uncomment port 0 but the snippet has otherwise.

Disable unencrypted IMAP and POP3 by setting the protocols’ ports to 0, as shown below. Ensure that the entries for port and ssl below the IMAPS and pop3s entries are uncommented:

/etc/dovecot/conf.d/10-master.conf

service imap-login {
inet_listener imap {
  #port = 0
}
inet_listener imaps {
port = 993
ssl = yes
}
  ...
  service pop3-login {
    inet_listener pop3 {
      port = 0
    }
inet_listener pop3s {
  port = 995
  ssl = yes
}
  ...
  }

I'm not very familiar with Dovecot, but can give you some hints. It appears that the port = 0 under inet_listener imap should not be commented as shown in the guide. However, your IMAP and POP settings shouldn't affect mail delivery by Postfix at all.

What is important for delivery is this:

service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    mode = 0600
    user = postfix
    group = postfix
   }
    # Create inet listener only if you can't use the above UNIX socket
    #inet_listener lmtp {
      # Avoid making LMTP visible for the entire internet
      #address =
      #port =
    #}
  }

When Dovecot is started, this should create a socket at /var/spool/postfix/private/dovecot-lmtp. You can see whether this socket exists by running this as root:

# ls -l /var/spool/postfix/private/dovecot-lmtp
srw------- 1 postfix postfix  0 Aug 19 19:41 /var/spool/postfix/private/dovecot-lmtp

The initial s means this is a socket, and the user and group need to both be postfix. If you get "no such file or directory" then Dovecot did not create the socket and you will need to look in its logs to see why.