Sep
17
2008
How to configure Qmail / Plesk to listen to additional SMTP port
Posted by keith in Plesk, QmailMany IPS block the use of the standard mail SMTP port (port 25).
In order to deal with this SMTP can be configured to run on alternate/additional ports.
The process for this is fairly simple:
Copy /etc/xinetd.d/smtp_psa to smtp2_psa
In the new file, REPLACE service smtp WITH service smtp2
Then modify /etc/services and add the smtp2 service (port 26 in this example).
smtp2 26/tcp mail
smtp2 26/udp mail
Then restart xinetd
/etc/init.d/xinetd restart
Check that the new port is now listening
# netstat -plunt |grep :26
That should return something similar to
tcp 0 0 0.0.0.0:26 0.0.0.0:* LISTEN 2345/xinetd
Test connection by telnetting from an outside box to port 26 on the server:
telnet 123.123.123.123 26
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