Mailhandler processes ALL messages if "Delete messages after they are processed" option is checked.

This post is probably not what you are thinking - I am not sad that all of my emails accidentally got deleted or something. I would actually be quite happy if that had been the case. My Mailhandler mailbox had a few dozen emails in it, and I decided I'd rather have Mailhandler simply delete them after processing rather than marking them as read, so I checked the "Delete messages after they are processed" box on admin/content/mailhandler/edit. Big mistake. It would seem that when this option is enabled, Mailhandler no longer checks to see if messages are unread before processing them - thus, every email in the box was processed a second time. This is very bad because on my site Mailhandler is integrated with Notifications to create a listserv, so all of the emails were also resent to all subscribers of the site.

This functionality should either be changed - so that Mailhandler won't process a message unless it is unread - or there should be a very large warning under the option advising users to purge their mailbox before enabling it.