I'm forwarding this message posted to the announcement mailing list
originally, to let you know any upgrades should target 2.4.16 as opposed to
We are pleased to announce the release of Cyrus IMAPd 2.4.16.
This is a stable release in the 2.4.x series.
It contains exactly one bugfix in tools/rehash, which was rewritten after
2.4.14 introduced a critical fault for deployments that have the fulldirhash
option enabled. Release 2.4.15 was released to resolve this issue, among
others, but the tool as released with 2.4.15 contained Perl syntax errors.
We recommend ALL sites that deploy Cyrus IMAP with the fulldirhash option
enabled to update to 2.4.16.
Please see bug #3651 for a full history of this bug. A special thanks goes
out to Carlos Velasco for catching and reporting this issue first.