On 8.11.2011, at 16.36, Peer Heinlein wrote:

Will dsync also use zlib-compression when copying mails from one side to another?

As long as the zlib plugin is globally enabled and zlib_save setting is set.

Wouldn't this be a good way to compress existing mails?

http://wiki2.dovecot.org/Plugins/Zlib

says, there's no way to do that. But dsync should respect the zlib-Plugin...

Well .. You could think of compressing existing mails with dsync the same as "migrating from maildir" to "migrating to maildir with zlib enabled" :) I'll add a note to the wiki page.