Nice work! Rated 4 out of 5 stars

Simple, useful and nice add-on. But I have a problem with HTML mails using plain text signature.
I have added a few lines of code to your add-on to prevent that problem, and I will give you those lines with pleasure. Are you interested?

This review is for a previous version of the add-on (0.2). 

Yes I am interested, please :-)