Using a different port for SMTP

Where can I change my preference of port number for SMTP? I would like to use 366 since I think my ISP is blocking port 25.

Your ISP blocks inbound and/or outbound 25?
Port 25 is used for server-server communication and can't be changed.
If your ISP blocks port 25 inbound, then your server can't receive mail from other servers, even if you change it's port.
If your ISP blocks 25 outbound, you still need to send to a destination port 25. For outbound, the only thing you can do is relay through your ISP (either from client, or configure postfix to relay through ISP).
When people add alternate ports for SMTP, it's for the mail client to submit mail to the server. From there, server-server is always going to have a dest port of 25.
If you wish to add an alternate port (you said you wanted 366) for mail submission, edit /etc/postfix/master.cf
Find this line:
smtp inet n - n - - smtpd
add another below it (location doesn't really matter) like this:
366 inet n - n - - smtpd
Then stop/start mail server and port 366 will accept smtp connections.
FYI- the standard port for smtp submission is 587. Doesn't matter if you want to use another port (366), just make sure you're not trampling on another service which may use that port.
Jeff

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TS3899 what is the outgoing server port for smtp

what is the outgoing server port for smtp

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Using a different port for SMTP

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