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Update documentation for Implicit TLS (#16220)

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As per RFC 8314, it is now recommended to prefer TLS over STARTTLS.

Fix #16160

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2021-06-21 19:34:37 +01:00 committed by GitHub
parent 681e81babd
commit 6a083a7234
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2 changed files with 4 additions and 4 deletions
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4
custom/conf/app.example.ini
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@ -1387,8 +1387,8 @@ PATH =
;; Mail server
;; Gmail: smtp.gmail.com:587
;; QQ: smtp.qq.com:465
;; Using STARTTLS on port 587 is recommended per RFC 6409.
;; Note, if the port ends with "465", SMTPS will be used.
;; As per RFC 8314 using Implicit TLS/SMTPS on port 465 (if supported) is recommended,
;; otherwise STARTTLS on port 587 should be used.
;HOST =
;;
;; Disable HELO operation when hostnames are different.

4
docs/content/doc/advanced/config-cheat-sheet.en-us.md
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@ -550,9 +550,9 @@ Define allowed algorithms and their minimum key length (use -1 to disable a type
- `DISABLE_HELO`: **\<empty\>**: Disable HELO operation.
- `HELO_HOSTNAME`: **\<empty\>**: Custom hostname for HELO operation.
- `HOST`: **\<empty\>**: SMTP mail host address and port (example: smtp.gitea.io:587).
- Using opportunistic TLS via STARTTLS on port 587 is recommended per RFC 6409.
- As per RFC 8314, if supported, Implicit TLS/SMTPS on port 465 is recommended, otherwise opportunistic TLS via STARTTLS on port 587 should be used.
- `IS_TLS_ENABLED` : **false** : Forcibly use TLS to connect even if not on a default SMTPS port.
- Note, if the port ends with `465` SMTPS/SMTP over TLS will be used despite this setting.
- Note, if the port ends with `465` Implicit TLS/SMTPS/SMTP over TLS will be used despite this setting.
- Otherwise if `IS_TLS_ENABLED=false` and the server supports `STARTTLS` this will be used. Thus if `STARTTLS` is preferred you should set `IS_TLS_ENABLED=false`.
- `FROM`: **\<empty\>**: Mail from address, RFC 5322. This can be just an email address, or
the "Name" \<email@example.com\> format.