See those two -- in your image. They signify the start of your signature. I assume that is the line, but your text would indicate your signature is actually blank. the -- do not appear unless the identity has a signature set, or perhaps you have a signature addon at work that is entering some sort of null signature. ______________________________________________________________________ I assume you created that signature using some sort of text editor and it has brought it's own fonts with it. If you used word for instance it will have the entire contents of words Normal.dot/m template embedded with it.

I have a plain text signature in one of my identities and the fonts associated with the message are unaffected when it is included. So there has to be some HTML and provably CSS somewhere.