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Fall back to In-Reply-To and References headers when sub-addressing is not available

username-removed-128633 requested to merge 2364-fallback-to-in-reply-to-header into master

Originally opened at !3024 (closed) by @dabit.

Fixes #2364 (closed)

Summary of the changes:

  • No more need to have the %{key} placeholder in the incoming_email.address
  • The fallback message id format is reply-[key]@[gitlab_host] (reminder: it doesn't have to be a real email address)
  • The fallback message id that includes the reply key is added to both References header
  • Documentation for the "Reply by email" feature updated

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