On 17.8.2012, at 14.24, Oleksii Krykun wrote:

Trying to implement expire plugin. expire-tool works fine. This delete expunged messages but not all of them. I have duplicate messages in appropriate folder. These messages are from expanding postfix aliases (e.g. postmaster@, hostmaster@, abuse@ etc. points to same mailbox and spam often sent to all of them. If duplicate message is received only one entry in dovecot-uidlist is created and only first of duplicates is deleted with expire-tool. Rest of duolicates are not deleted.

Any suggestions.

No idea, but if it's a bug, it won't be fixed anymore in v1.2. The whole thing has been rewritten in v2.x. I suggest upgrade.