[Dovecot] How to delete retrieved mail

Hi All,

I use Dovecot and XMail on a QNAP TS-509 NAS. QNAP has combined the two into a package they call XDove. Everything seems to be working great except for one thing. When Dovecot retrieves the mail from XMail it is not removing it from XMail. It is leaving a copy on XMail. Is there an option I can set in Dovecot so it will delete the mail message from XMail when it retrieves it.

Thanks

Don