Get exim to listen on another port on top of port 25
For example, to get exim to listen on both port 25 and port 587, you’d add the following code to the very top of the /etc/exim.conf file:
daemon_smtp_ports = 25 : 587
To specify listening on ports 25 and 26 on all interfaces:
daemon_smtp_ports = 25 : 26
Once saved, restart exim:
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