[Dovecot] Converting old emails to compressed format

[Timo Sirainen]

On 29 Jul 2014, at 18:22, Wolfgang Rosenauer <wrosenauer at gmail.com> wrote:

> Hi Christian,
> 
> On Tue, Jul 29, 2014 at 5:13 PM, Christian Rohmann
> <crohmann at netcologne.de> wrote:
>> 
>> You have to set the compression type with the zlib_save option.
>> 
>> i.e.:  "-o plugin/zlib_save=gz"
> 
> been there:
> dsync -o plugin/zlib_save=gz backup -u testy
> maildir:/srv/dovecot/testy/maildir.new
> 
> doesn't make a difference unfortunately.
> My mailboxes are in maildir format and besides enabling zlib I do not
> change the format.
> My testmailbox has only one message but this still is uncompressed after dsync.
> 
> Where is Peer who wrote in his book that this should just work?

Maybe it's trying to copy the mails by hard linking instead of physically copying the data. See if -o maildir_copy_with_hardlinks=no helps?