Option to automatically clear email inbox content after X months.
Add to email address mailbox configuration - after mailbox size.

Thank you for your input. We will consider this functionality in upcoming releases if it is popular. Everyone, please continue voting for this feature if you consider it important.
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Brainforge.UK commented
Have account with over 60,000 emails going back over 2 years in location.
/var/qmail/mailnames/######/######/Maildir/curWith suggested option subscription owner could configure regular cleanup themselves - assume they would be in control of downloading emails to mail client.
The other alternative is for the Plesk admin to have a 6 month old mail cleanup script - bit heavy handed, subscription owner has no control.