50 lines
2.0 KiB
Plaintext
50 lines
2.0 KiB
Plaintext
MBOX-Line: From mrc at CAC.Washington.EDU Sun Jan 6 19:59:57 2008
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To: imap-protocol@u.washington.edu
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From: Mark Crispin <mrc@CAC.Washington.EDU>
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Date: Fri Jun 8 12:34:41 2018
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Subject: [Imap-protocol] Checking for new messages
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In-Reply-To: <1199677810.8368.16.camel@infidel>
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References: <1199677810.8368.16.camel@infidel>
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Message-ID: <alpine.OSX.1.00.0801061950570.18754@pangtzu.panda.com>
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On Sun, 6 Jan 2008, Steve Freitas wrote:
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> With IMAP4, it seems to be more complicated, but I hope I'm missing
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> something here.
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IMAP should be easier, MUCH easier, than POP3; UIDs are numeric and
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strictly ascending. That means that you never need to fetch the map to
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learn about new messages; you can simply fetch <lastuid+1:*>.
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> I can't use message sequence numbers in any way to do
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> this, because they're unstable (since deleting a message decrements all
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> sequence numbers above that of the deleted message). And I can't use
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> UIDs if, like I'm experiencing when dealing with the Courier IMAP
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> server, I get a new UIDVALIDITY number every time I connect to the
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> server and open a mailbox.
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I suggest that you should use UIDs anyway and ignore the brokenness of
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that server. Courier is a horrible server, but I suspect that this is a
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problem in that particular installation of Courier.
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A server changing UIDVALIDITY has a specific meaning in IMAP: toss out
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everything you remember from before and start anew. You should NOT
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attempt to overengineer and outsmart the protocol specification, even in
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the face of a broken server. Otherwise, someone is going to attempt to
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overengineer and outsmart the protocol specification in order to get the
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desired results from your software.
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Remember: for every action there is an equal and opposition retaliation!
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If you absolutely insist upon not using UIDs,
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tag FETCH 1:* BODY[HEADER.FIELDS (Message-ID)]
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is a semi-reasonable approximation of POP3 UIDs.
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Good luck!
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-- Mark --
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http://panda.com/mrc
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Democracy is two wolves and a sheep deciding what to eat for lunch.
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Liberty is a well-armed sheep contesting the vote.
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