2

Postfix by default uses ports 25, 465 and 587. In my configuration, I enabled TLS encryption using the option smtpd_use_tls=yes in postfix's main.cf. This makes all smtp communications encrypted as far as I understand.

Since postfix takes only 1 certificate and doesn't support SNI, I would like to use nginx as a proxy to have the encryption decided by nginx based on SNI and domain name, as a proxy, and not by postfix.

I'm confused about the changes I have to do in postfix, and I would appreciate your help. Here are my questions:

1) When I send e-mails through my server, I use port 25. But what about receiving mail? Should I change all these ports that postfix uses (to replace them by nginx)? or just port 25 is enough?

2) When I use nginx as proxy, should I disable encryption in postfix? If I understand this whole thing correctly, then the internal proxy communication between nginx and postfix doesn't need encryption, so I should disable encryption once I start configuring that proxy using smtpd_use_tls=no, right?

I you require any additional information, please ask.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.