Really like the Mail Add-On and wanted to start a thread with feature requests for this offering:

In no particular order:
Allow complete view of emails sent and received by all users - instead of having to select a user one at a time

Allow the attachment of emails not associated by email address to a specific lead/contact etc.   - I.E. internal communication about a lead/potential, emails from 3rd parties about lead/potential, etc.

Please feel free to add.
Thanks
-g-