How do I set up a signature that includes my company logo that is visible when others open my mail?
I have dragged a logo with contact info into my signature window formatted as a .tiff, .jpg, .pdf, etc. and when I compose new mail it is visible precisely as I have set it up. However, it is visible only to other Mac recipients that receive my mail. Window recipients either cannot see it or see it only as an attachment.
I personally don't like HTML emails (or bulky&busy emails from companies) ... BUT... I know that Thunderbird allows you to compose HTML signatures. So if you cannot figure out how to do this in mail.app you may want to switch to TB.