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2Cyrus IMAP 2.4.21 Release Notes
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5* Fixed :issue:`885`: timsieved segfault (thanks Christian Henz)
6* Fixed :issue:`2199`: better recovery from mupdate failure (thanks Michael
7  Menge)
8* Fixed: sync_client now replicates annotations in user/mailbox mode (thanks
9  John Capo)
10* Fixed: build failure with LibreSSL 2.7 (thanks Bernard Spil)
11* Fixed: XFER now correctly distinguishes between 2.3.x releases
12* Fixed :issue:`3123`: XFER now recognises 3.1, 3.2 and 3.3 backends
13* Fixed: XFER now syslogs a warning when it doesn't recognise the backend
14  Cyrus version
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16:ref:`imap-release-notes-2.4`
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