How to change PowerMTA SMTP port
smtp-port specifies the TCP port number to use for listening for incoming SMTP connections, allowing you to run PowerMTA on a non-standard port.
Default:
25 (standard SMTP port)
This can be useful if a second mailer handles all incoming traffic while PowerMTA is fed through another TCP port.
If smtp-port is set to 0, PowerMTA does not listen for incoming connections (and feeding is only possible through the submission APIs).
Example:
# use port 2525 since port
smtp-port 2525
Another way:
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