dovecot - Jul 2011 - vpopmail + dovecot-lda doubling deliver messages

We use qmail + vpopmail + dovecot, limits and alias are in vpopmail mysql
database, it has worked ok.

The .qmail-default:

| /data/vpopmail/bin/vdelivermail '' bounce-no-mailbox |
/var/qmail/bin/preline -f /usr/local/dovecot/libexec/dovecot/deliver -d
$EXT@$USER



When you send a message to alias works OK.

The problem that is happening that is sent to asdf at domain.com
asdf at domain.com he is doubling the email.

Come the email that you sent / wrote an email and more with nearly no head,
no matter.

Searching is very realized that something related to Deliver the dovecot.

Can you help us? Tips?

Thank you all.