How to Set an Alternate SMTP port in Plesk on Linux
Getting Plesk to listen for SMTP connections on an alternate port is not that difficult to do. However, unlike a cPanel environment, configuring Plesk to do so must be done outside the control panel via the command line.
The procedure outlined below is complex and requires some basic command line knowledge. Liquid Web’s systems administrators are always available to assist with this or any other issue. Feel free to contact Liquid Web via Toll-Free 1.800.580.4985, International 517.322.0434, email@example.com or open a support ticket in your my.liquidweb.com interface.
First, a new entry will need to be created in xinetd for the alternate port:
cp smtp_psa smtp_psa_p26
Next, the entry that was just created needs to be modified:
Make the first line say “service smtp_p26” and save the file.
Next edit the services for the system to include the newly created one:
smtp_p26 26/tcp mail
smtp_p26 26/udp mail
After editing this, just restart xinetd and the server should be listening on port 26. A quick way to verify the changes took effect can be done using this command:
netstat -lpn|grep 26
NOTE: Don’t forget to make sure port 26 is open in the firewall. A walkthrough on how to do this can be found here in our apf-firewall article.
Liquid Web’s Heroic Support is always available to assist customers with this or any other issue. If you need our assistance please contact us:
About the Author: J. Mays
As a previous contributor, JMays shares his insight with our Knowledge Base center. In our Knowledge Base, you'll be able to find how-to articles on Ubuntu, CentOS, Fedora and much more!
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