Make Contact Requests more visible

I think we need email displaying for various reasons. Just not for manually looking for “contact requests” or email delivery failures.

The failures need to be detected automatically, and may only need to be displayed to the user in a special error message with the raw text, if they can not be parsed and assigned to a recently sent message that does not yet have a delivery receipt.

Most if not all? failure receipts

  • come From: MAILER-DAEMON@
  • And the text body contains at least this header data from the original message:
    • From:
    • To:
    • Subject:
    • Date:

Which should already be sufficient to detect the affected, recently sent message.

But some failure receipts even contain

  • an X-Failed-Recipients: header.
  • or contain the original Message-ID in the text body
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