Change port

[sweetromain]

Hello,
How can I change port 25 to 587 (25 is blocked by lot of ISP) ? When I try some edit, like ' -p 2587:587 -e "RELAY_HOST=relay:587" ' or iptables redirect in container or edit master.cf. I can't use relay.
Relay return good message on port 25 but on change to 587 it failed.

[Turgon37]

Hello @sweetromain the port 25 is the official smtp port on the internet. So if your need to use another one, please proxy your new port to 25 because the submission port 587 is not enabled

 -p 2587:25