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Support Implicit TLS for sending emails (#13317)

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Previously, TLS could only be used with STARTTLS.
Add a new option `force_tls`, where TLS is used from the start.
Implicit TLS is recommended over STARTLS,
see https://datatracker.ietf.org/doc/html/rfc8314

Fixes #8046.

Signed-off-by: Jan Schär <jan@jschaer.ch>
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Jan Schär 2022-07-25 17:27:19 +02:00 • committed by GitHub
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commit e8519e0ed2
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5 changed files with 99 additions and 13 deletions
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11
docs/usage/configuration/config_documentation.md
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@ -3187,9 +3187,17 @@ Server admins can configure custom templates for email content. See
This setting has the following sub-options:
* `smtp_host`: The hostname of the outgoing SMTP server to use. Defaults to 'localhost'.
* `smtp_port`: The port on the mail server for outgoing SMTP. Defaults to 25.
* `smtp_port`: The port on the mail server for outgoing SMTP. Defaults to 465 if `force_tls` is true, else 25.
_Changed in Synapse 1.64.0:_ the default port is now aware of `force_tls`.
* `smtp_user` and `smtp_pass`: Username/password for authentication to the SMTP server. By default, no
authentication is attempted.
* `force_tls`: By default, Synapse connects over plain text and then optionally upgrades
to TLS via STARTTLS. If this option is set to true, TLS is used from the start (Implicit TLS),
and the option `require_transport_security` is ignored.
It is recommended to enable this if supported by your mail server.
_New in Synapse 1.64.0._
* `require_transport_security`: Set to true to require TLS transport security for SMTP.
By default, Synapse will connect over plain text, and will then switch to
TLS via STARTTLS *if the SMTP server supports it*. If this option is set,
@ -3254,6 +3262,7 @@ email:
smtp_port: 587
smtp_user: "exampleusername"
smtp_pass: "examplepassword"
force_tls: true
require_transport_security: true
enable_tls: false
notif_from: "Your Friendly %(app)s homeserver <noreply@example.com>"