I found the original anouncement in the archives:
Hi,
I've just uploaded dovecot 2.1.17 to our repos for debian wheezy (both
amd64 and i386). I did this since the package shipped with wheezy
(2.1.7) contains a bug[1] in the handling of sieve commands that was
fixed upstream back in February 2013. Unfortunately, the commit never
found its way back to debian stable.
The package is essentially a rebuild of the package found in debian
jessie, no patch added.
If for some reason you don't want to use this package, you'll need to
manually exclude it.
Thanks.
[1] http://sogo.nu/bugs/view.php?id=2230
[2] http://hg.rename-it.nl/dovecot-2.1-pigeonhole/rev/32d178f5e1a2
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