Computer Help and Support

Mailwasher.

http://www.mailwasher.net/

There is a free version as well as paid. Haven't checked the differences but look for the ability to bounce and blacklist.

I've been using a much older version for years. It needs a little configuration; ie your mail server settings & password but nothing too difficult. Basically, you run Mailwasher, it lists the mail on your server and you have an option to delete, download, bounce and/or blacklist, then it processes the mail. It deletes from the server the stuff you don't want and then it downloads the selected emails and opens your mail program. This modern version may do much more than that. I know it has IMAP support.