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
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providers	FIX: Add random suffix to outbound Message-ID for email (#15179)	2021-12-06 10:34:39 +10:00
sync.rb	FIX: Add random suffix to outbound Message-ID for email (#15179)	2021-12-06 10:34:39 +10:00