[Bug 693134] Re: Uncaught bounce from Dovecot when Quota Exceeded

[Mark Sapiro]

I have thought about this some more and looked more carefully at RFC
3798, and I don't think RFC 3798 MDNs should be considered bounces. The
first paragraph of the Abstract of RFC 3798 says:

   This memo defines a MIME content-type that may be used by a mail user
   agent (MUA) or electronic mail gateway to report the disposition of a
   message after it has been successfully delivered to a recipient.
   This content-type is intended to be machine-processable.  Additional
   message headers are also defined to permit Message Disposition
   Notifications (MDNs) to be requested by the sender of a message.  The
   purpose is to extend Internet Mail to support functionality often
   found in other messaging systems, such as X.400 and the proprietary
   "LAN-based" systems, and often referred to as "read receipts,"
   "acknowledgements", or "receipt notifications."  The intention is to
   do this while respecting privacy concerns, which have often been
   expressed when such functions have been discussed in the past.

The key point is that the purpose of an MDN is for an MUA to report the
disposition of a message after it has been successfully delivered to a
recipient. Thus, it's use by the Dovecot LDA to report non-delivery due
to over quota or other reasons seems incorrect, and Dovecot should be
sending a DSN with a 'failed' action for the recipient rather than an
MDN with a 'deleted' disposition which is intended to report that the
message was deleted by the recipient after successful delivery and which
should not in general be interpreted as a bounce.

Thus, I think Dovecot's behavior is incorrect, and the best we can do in
Mailman is to recognize the "Your message to <user at example.com> was
automatically rejected:" line in the simple text matcher as a work
around.

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https://bugs.launchpad.net/bugs/693134

Title:
  Uncaught bounce from Dovecot when Quota Exceeded