53 lines
2.1 KiB
Plaintext
53 lines
2.1 KiB
Plaintext
MBOX-Line: From jkt at flaska.net Sun Jun 10 11:45:31 2012
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To: imap-protocol@u.washington.edu
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From: =?UTF-8?B?SmFuIEt1bmRyw6F0?= <jkt@flaska.net>
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Date: Fri Jun 8 12:34:48 2018
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Subject: [Imap-protocol] QRESYNC and new arrivals which get deleted
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immediately through VANISHED
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In-Reply-To: <4FD221F9.8090601@flaska.net>
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References: <4FD221F9.8090601@flaska.net>
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Message-ID: <4FD4EB4B.7050000@flaska.net>
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I'm afraid I've found another possible issue with QRESYNC. The RFC5162
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is pretty clear that servers SHOULD inform only about those UIDs which
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are expunged "right now" through the VANISHED response. Unless I'm
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terribly mistaken, it means that a client has to handle VANISHED
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responses which refer to UIDs which were expunged a long time ago, and
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servers *can* send them and still be called compliant.
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I believe that this brings a few issues in the following scenario (where
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mailbox contains one message with UID 5; UIDNEXT is 11, everything is
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synced):
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S: * 3 EXISTS
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S: * VANISHED 12:20
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The server is telling me that any UIDs between 12 and 20 are gone. The
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problem is that I don't know whether any message has got this UID, ie.
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whether the messages #2 and #3 (the first and second arrivals) fall into
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that range. What shall a compliant IMAP client do at this point? Shall I
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remove any messages upon receiving the VANISHED response? Shall I send a
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UID SEARCH command to find out what new messages are really there?
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That'd complicate my code quite a lot, unfortunately.
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Even more entertaining would be an interaction where the server
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occasionally sent a regular EXPUNGED instead of VANISHED (it's allowed
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to do so per RFC 5162); that'd lead to an interesting mix of unknowns
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about a mailbox' state...
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I'm looking forward to answers about this matter.
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With kind regards,
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Jan
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--
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Trojita, a fast e-mail client -- http://trojita.flaska.net/
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