Yes it needs to be a real domain name so other servers on the internet can access it.
You should set /etc/hostname to the real domain FQDN as well as adding it to /etc/hosts and add it to /etc/mailname
Then make sure you've set your DNS servers to point an A record for your FQDN to your ip, this may take a day to take effect (normally only 15 minutes).
Lastly your /etc/postfix/main.cf should look something like this
Code:
# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.
myorigin = /etc/mailname
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no
# appending .domain is the MUA's job.
append_dot_mydomain = no
# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h
readme_directory = no
# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.
myhostname = YOURFQDN
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = localhost, localhost.$mydomain, localhost
relayhost =
mynetworks = 127.0.0.0
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = 127.0.0.1
inet_protocols = ipv4
Note replace YOURFQDN with your FQDN, (that's my working config btw).
If you're using a firewall you'll need to allow outbound access on port 25.
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