Mail receiver app

Where is the best place to ask about mail receiver topics? Here, or another forum?

Specifically I am after details on what appear to be a pair of port numbers (25 : 25). It’s not clear to me why there are two ports here, not just one for SMTP. I cant find documentation in github.

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Are you talking about Straightforward direct-delivery incoming mail?

The first 25 is the external ip, the second is the ip inside the container.

What problem are you trying to solve?

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Thanks. Where is that documented?

Problem - trying to run normal enterprise class Postfix server for mail on same server as Discourse container. I need to have email for other websites, but mail-reciever sits on SMTP port 25.

For lack of other guidance I thought I could attempt to change the mail-receiver SMTP port and use LMTP or something from Postfix to route messages for that domain to that port. But I am rather lost.

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It’s a docker fundamental. Most any “how to use docker” guide covers it, I’d think.

I gave an answer to this question over at Postfix and mail receiver - #5 by pfaffman.

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