I'm trying to setup postfix to allow relaying from two specific IP addresses -- office and home.
It works with the first IP address (office), but not from home. I'm stumped.

I have this set:

mynetworks = 127.0.0.0/8 24.12.24.23 24.12.22.17

The IP in green works just fine. It is my office. The one in red doesn't work.

Can anyone help me with what I might be missing?

What error message do you get in /var/log/mail.log or wherever you are logging mail?

Also, post the output of `postconf -n`.

Thank you for your help.
The error I'm getting now on my laptop at home is: "Can not connect to SMTP server."

I can take this same laptop, without changing anything, and it works fine at the office.
There isn't a record in the mail log because it isn't connecting. I'm stumped on that.

Here is the postconf - n.
Thanks much.
alias_maps = hash:/etc/aliases
config_directory = /etc/postfix
debug_peer_level = 2
default_destination_concurrency_limit = 5
default_destination_recipient_limit = 10
home_mailbox = Maildir/
html_directory = no
mailbox_size_limit = 256000000
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
maximal_queue_lifetime = 2d
mydestination = hash:/etc/postfix/mydomains
mynetworks = 127.0.0.0/8 24.12.24.23 24.12.22.17
newaliases_path = /usr/bin/newaliases.postfix
queue_run_delay = 10000s
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
sample_directory = /usr/share/doc/postfix-2.3.3/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_sasl_security_options = noplaintext
smtpd_banner = $myhostname ESMTP $mail_name
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_pipelining, reject_invalid_hostname, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_unauth_destination, reject_unknown_recipient_domain, reject_non_fqdn_recipient
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_timeout = 5
unknown_local_recipient_reject_code = 550
virtual_alias_maps = hash:/etc/postfix/virtual

Is your home ISP blocking SMTP traffic? A large number do, these days, to stop spam (use their relay or else). Does your linode have a firewall so only specific IP addresses can connect?

From your laptop at home, what is the result of "telnet your-inode 25" ? What about "telnet your-inode 587" ? It's possible you could run an authenticating SMTP server on the SMTP-submission port (587) if your ISP is blocking port 25.

_________________
Rgds
Stephen
(Linux user since kernel version 0.11)

Hey, thanks much!

It was so easy.

I just tested port 25, and yes, it is being blocked by my ISP.
So, I just changed postfix to another port for SMTP and viola..... workslike a charm.

Thank you much.