discourse/lib/imap/providers
Martin Brennan 3b13f1146b
FIX: Add random suffix to outbound Message-ID for email (#15179)
Currently the Message-IDs we send out for outbound email
are not unique; for a post they look like:

topic/TOPIC_ID/POST_ID@HOST

And for a topic they look like:

topic/TOPIC_ID@HOST

This commit changes the outbound Message-IDs to also have
a random suffix before the host, so the new format is
like this:

topic/TOPIC_ID/POST_ID.RANDOM_SUFFIX@HOST

Or:

topic/TOPIC_ID.RANDOM_SUFFIX@HOST

This should help with email deliverability. This change
is backwards-compatible, the old Message-ID format will
still be recognized in the mail receiver flow, so people
will still be able to reply using Message-IDs, In-Reply-To,
and References headers that have already been sent.

This commit also refactors Message-ID related logic
to a central location, and adds judicious amounts of
tests and documentation.
2021-12-06 10:34:39 +10:00
..
detector.rb FIX: IMAP archive fix and group list mailbox code unification (#10355) 2020-08-04 14:19:57 +10:00
generic.rb FIX: Add random suffix to outbound Message-ID for email (#15179) 2021-12-06 10:34:39 +10:00
gmail.rb FEATURE: Improve group email settings UI (#13083) 2021-05-28 09:28:18 +10:00