if you want to delete mails from plesk older than 30 days here the command
In order to see the mail log files, you should be logged into SSH as root. The qmail logs are located in the following directory:
WHAT IS BARUWA ? Baruwa (swahili for letter or mail) is a web 2.0 MailScanner front-end.
This guide will show you how to enable the queuelifetime option in Plesk. This is a file that defines how long your server will attempt to process or deliver an email before bouncing it to the originating sender defined in the header of the email message.
Resolution Since Parallels Plesk Panel version 8.4 it is possible to limit maximum number of recipients for email message. To prevent your users from sending mass e-mail, do the following:
On your plesk dedicated server you already have qmail as your mail server and now you’re looking to manage the qmail message queue. qmHandle is the simple program for this.