[Dovecot] Expire-tool does not delete duplicate messages (dovecot-1.2.17)

[Oleksii Krykun]

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.

Thanks,
Kryol