Special Mention: Mail Print 1.3 - Automatic Email Printing Tool

[LazyLion]

Mail Print automatically prints emails and attachments from multiple POP accounts. You can filter some, but more control over what gets printed and how it looks could be nice.

Note: The website says it has been discontinued, but you can still click through and download a free version....
http://www.mail-print.com/
http://www.mail-print.com/downloads/index.html

This program did for me what Outlook 2013 could not do!