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I'm running a postfix server - for several weeks without problems, but now mails bounce. After one day, I got the following mail from gmail, when I tried to send a mail to my server:

Delivery to the following recipient has been delayed:

     <the mailadress>@<myserver>

Message will be retried for 2 more day(s)

[mx.<myserver>. (0): Connection refused]

The logs mail.log, mail.err and mail.warn are empty except of some strange errors of the form:

postfix/trivial-rewrite[22141]: warning: regexp map /etc/postfix/virtual, line 12: ignoring unrecognized request

The virtual aliases is also the only thing I changed in the last time (but afterwards it was still working).

Any hints how I could troubleshoot this?

Note that sending a mail to a local user from a local user works.

Also there is a open port although "" looks strange to me...

$ netstat -a|grep smtp
tcp        0      0          *:*                     LISTEN     
tcp        0      0 localhost.localdom:smtp *:*                     LISTEN   


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_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 = <my servername>
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
#virtual_alias_maps = regexp:/etc/postfix/virtual
virtual_alias_maps = hash:/etc/postfix/virtual

myorigin = /etc/mailname
mydestination = <myserver>, localhost
relayhost = <my external smtp>
mynetworks = [::ffff:]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = loopback-only
default_transport = smtp
relay_transport = smtp
inet_protocols = ipv4
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up vote 3 down vote accepted

Your inet_interfaces parameter is set to loopback-only. This is why local mail delivery is working.

Change this to all and it will be listening on all interfaces.

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Uh... I think I added this, because because I don't want it to be an open relay... Of course it shouldn't be a spambot. See this Q&A for example. – lumbric Feb 18 '12 at 15:00
Yes, but if you want to accept mail from remote systems then you have to have the MTA listening on your ethernet interfaces, not just loopback. If it's an outbound-only system, then add a firewall rule to block port access from remote networks. – James O'Gorman Feb 18 '12 at 16:29

Apparently, your email server is listening to the loopback address only as it is shown by netstat output. You can try commenting out the following line in your config.

#inet_interfaces = loopback-only

Don't forget to reload/restart your postfix process. It is a good idea to confirm this change was successful using netstat.

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