No, it is not obsolete, quite contrary actually. See RFC8314. The implicit TLS s... | Hacker News

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		Avamander on Feb 23, 2023 \| parent \| context \| favorite \| on: Poste.io – Complete Mail Server No, it is not obsolete, quite contrary actually. See RFC8314. The implicit TLS submission port got deprecated for a brief time, but it's no longer deprecated. Explicit TLS is a terrible idea and for that reason it's recommended to provide implicit TLS (submissions).

imp0cat on Feb 24, 2023 [–]

Hey! Thanks for the clarification, looks like an exception was made specifically for smtp. And after reading their reasoning, it does make sense.

Server operators should (and do) provide both 486 and 587 in order to maximize the amount of secure connections to their servers.

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