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Dec 22, 2016 at 15:59 answer added derobert timeline score: 1
Dec 7, 2016 at 12:44 comment added phk Would network namespaces help? You could have a namespace for just this one program and no other program could use your interface then.
Dec 6, 2016 at 20:32 comment added DopeGhoti In that case, you probably need to enable SMTP authentication in your mail transfer agent, and refuse to deliver anything not thusly authenticated.
Dec 6, 2016 at 20:19 comment added G Bagoy Probably I was not clear. I am talking about outgoing email, not incoming. I need to accept incoming email, that is not a problem. I do not want local processes to be able to send email directly, without using my postfix, and I don't want local processes to be able to send email through postfix without authentication.
Dec 6, 2016 at 17:08 comment added DopeGhoti have your SMTP agent only listen on the loopback address; then no external mail sources will even be talked to, much less have their messages accepted for delivery.
Dec 6, 2016 at 17:07 review First posts
Dec 6, 2016 at 17:17
Dec 6, 2016 at 17:02 history asked G Bagoy CC BY-SA 3.0