How to change default port 25 for Mail Server?

TheWormsUnited

Hi everyone, I am using a test mode server with Google Cloud Services platform, the issue is Google cloud does not release port 25 for mail service therefore i cannot use and start postfix, dovecot and Opendkim. All services are stopped.

Upon checking online for a few solutions, I found that we can replace the Port 25 to another one for example 547.

My question is, can we do that without breaking the aaPanel code? Anyone has tested this out?

aaPanel_Jose

TheWormsUnited
Communication between mail servers must use port 25 ··

TheWormsUnited

aaPanel_Jose ok then with google cloud servers platform aaPanel cannot be used at all since Google does not open port 25 to anyone.

itspathanofficial

TheWormsUnited is there any way to change port from 25 to 587?

paulolira

Digital ocean not open port 25 for smtp, they force u to use 587, how we change that?

idflorin

paulolira https://www.faqforge.com/linux/how-to-enable-port-587-submission-in-postfix/

thiagotgc

I've already informed the developers to block port 25 for end-user connection...

The correct one is only the 587 and 465...
Port 25 must be ONLY for server-to-server communication