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Enable port 26 for smtp with Plesk

Thanks to this post for the information.

In ‘/etc/xinetd.d/’ there is a file called smtp_psa, you will need to copy this file to another filename (in this example I’ll use smtp2_psa).

In this new file, you will want to change the line:
’service smtp’ to ’service smtp2′

Once this is complete, you will need to modify your /etc/services file, and add the smtp2 service:
Simply copy/paste the existing smtp line and change the name and port (we’ll use port 26 in this example).

smtp2 26/tcp mail
smtp2 26/udp mail

Restart xinetd.
/etc/init.d/xinetd restart

Check to make sure 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

You can test this connection from the outside by trying to telnet to port 26 on the server.
From a linux shell or Windows command prompt enter

telnet 123.123.123.123 26