First a new entry will need to be created in xinetd for the alternate port:
cd /etc/xinetd.d
cp smtp_psa smtp_psa_p26
Next the entry that was just created needs to be modified:
vi smtp_psa_p26
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:
vi /etc/services
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.
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Thanks.
