# Problem with SMTP configuration

**URL:** <https://meta.discourse.org/t/problem-with-smtp-configuration/65892>\
**Category:** Self-hosting\
**Created:** [July 9, 2017, 3:01pm UTC](https://meta.discourse.org/t/problem-with-smtp-configuration/65892 "2017-07-09T15:01:56Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![djr013](https://avatars.discourse-cdn.com/v4/letter/d/e68b1a/32.png) [@djr013](https://meta.discourse.org/u/djr013)\
**Post date:** [September 29, 2019, 5:46am UTC](https://meta.discourse.org/t/problem-with-smtp-configuration/65892/8 "2019-09-29T05:46:51Z")

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> [@mpalmer](#):
>
> Port 465 was, many years ago, SMTP over SSL/TLS – it doesn’t use STARTTLS. I say “was”, because it’s been deprecated for so many years that the IETF has deregistered smtps as a protocol. You should use either port 25 (SMTP) or port 587 (submission) and STARTTLS.

There’s a January 2018 IETF RFC which recommends use of port 465 for “implicit” TLS. A motivation for this is the increasing trend for mandatory encryption, which renders STARTTLS somewhat redundant. [RFC 8314 - Cleartext Considered Obsolete: Use of Transport Layer Security (TLS) for Email Submission and Access](https://tools.ietf.org/html/rfc8314)

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