On Sun, Nov 05, 2017 at 07:29:16PM +0100, Pau Peris wrote: > could someone tell, in his opinion, which would be the right way > to deliver remote messages to gmail? Looking at this [1] URL looks > like the only way available is through port 25.
See also RFC 5321. All mail exchange among unconnected sites exclusively takes place on port 25. > If i wanted my Postfix to communicate through 465 or 587 it would > need a user/pass but it looks weird to me. I mean, should an MTA > really need an account for each other MTA where to deliver email > messages? Of course not. Don't know if i'm missing something here. You're missing the above bit about mail exchange being exclusively done on port 25. Submission (587) or the deprecated, non-standard smtps (465) are for AUTHENTICATED USERS to submit mail. They are never to be used for server-to-server mail exchange. > This question comes because in my domains table, from the MySQL > database managed by Postfix, there's a domain which used to be > virtual but right now it is not so i changed the transport to > smtp:[aspmx.l.google.com]:25 If you are no longer hosting the domain, you probably need to remove it from your domains table. And likewise, remove it from your transport table. BTW if for some reason you did want to deliver "@example.com" to Google, simply use the MX lookup in your transport entry: example.com smtp:google.com > [1] https://support.google.com/a/answer/176600?hl=en -- http://rob0.nodns4.us/ Offlist GMX mail is seen only if "/dev/rob0" is in the Subject:
