Rated 5 out of 5 stars

a great tool - yes!
BUT: pls integrate a possibility to add an attachment... not that one via http://
i mean a comfortable way to attach an lokal file (e.g. pdf's) or a file located on a server in the LAN.
...this would be perfect!

anyway thx for that great tool.

This review is for a previous version of the add-on (2.6). 

I agree real file support would be nice. I can offer one solution though: If you set up the Thunderbird FileLink feature, then you can attach files using that. You can use a public service like YouSendit (Hightail), or if you have a webdav server you can use it with this extension: https://addons.mozilla.org/en-US/thunderbird/addon/webdav-for-filelink/