Adding a secondary SMTP port in Plesk

Choose an unused port and add it to the /etc/services file, for example:

smtp_alt 2525/tcp # new SMTP port

Make a copy of /etc/xinetd.d/smtp_psa to /etc/xinetd.d/smtp_psa_alt and correct service line within new file:

service smtp_alt

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

Edit the firewall, adding port 25025

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