You can now automatically delete mail from your Inbox, Drafts, Sent, Spam & Trash folders. This has been a highly requested feature.
The cleanup process runs nightly and can be configured for your entire domain or for specific mailboxes. You can configure this to occur either based on how long the email has been stored, or based on the number of emails in the folder. I’ve been using it for my Trash folder for the past month while it was in beta, and it works great.
You can find it in your control panel under Email Accounts > Settings > Folder Cleanup Settings.