Log Message:
Update dovecot2-pigeonhole to 0.4.1.  Here is quote from release announce.

Subject: [Dovecot-news] Released Pigeonhole v0.4.1 for Dovecot v2.2.4.
Date: Wed, 03 Jul 2013 22:15:31 +0200
To: dovecot-news@dovecot.org, Dovecot Mailing List <dovecot@dovecot.org>
Reply-To: dovecot@dovecot.org
Content-Transfer-Encoding: 7bit

Hello Dovecot users,

Now that I am not preoccupied anymore, I quickly release a new version
of Pigeonhole for Dovecot v2.2. This consists mainly of bug fixes. One
new feature is that the Sieve plugin will try to pass temporary
failures (e.g. from mail storage) back to LDA/LMTP as much as
possible. However, this change turned out a little bigger than I would
have liked, so experiment with it a bit before you deploy it in
production.

Changelog v0.4.1:

 + Added support for handling temporary failures. These are passed back
   to LDA/LTMP to produce an appropriate response towards the MTA.
 - Sieve storage: Removed PATH_MAX limitation for active symlink. This
   caused problems for GNU/Hurd.
 - Fixed line endings in X-Sieve headers added by redirect command.
 - ManageSieve: Fixed '[' ']' stupidity for response codes (only
   happened before login).
 - Fixed setting name in example-config/conf.d/20-managesieve.conf.
 - Sieve extprograms plugin: Fixed interaction between pipe command and
   remote script service. The output from the script service was never
   read, causing a broken pipe error at the script service. Apparently,
   this was broken since the I/O handling for extprograms was last
   revised.
 - Fixed assertion failure due to datastack problem in message header
   composition.