[Dovecot] dsync mirror duplicates problem

[Waldemar W.]

Im trying to sync 2 mailserver with dsync mirror functionality.

Problem occurs when mails arrive in the same folder on both sides then 
dsync sometimes runs into problems
and duplicates that entrys on both side(2mails then with same 
content). After running again
the same happens again(now 4 mails with same content on every side). 
And then duplicates this mails on
both sides on every run :(
Anyone with same problem or is something that could cause this? I 
tried dsync with and without -f option but no change.

Im running dovecot 2.0.1 together with dovecot sieve (latest hg 
version).

thanks,
Waldemar