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@domain.com asdf@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.