Automatic Dovecot v2.4 Debian Package
These Dovecot packages are automatically built from the upstream source repositories when the Dovecot developers commit any changes. The main repository for Debian testing is available at http://xi.rename-it.nl/debian/ and is updated on an hourly basis. The packages are automatically uploaded to the OpenSUSE build service on a daily basis to make these available on other systems and to a broader audience.
Keep in mind that these packages follow the most recent changes from developers directly and that therefore bugs and failures are not uncommon. These packages are meant for those people that want to test the most recent Dovecot versions and are explicitly NOT suitable for use on systems that need to be STABLE.
Check http://wiki.dovecot.org/PrebuiltBinaries#Automatically_Built_Packages for more information.