Currently I have an HTML signature for my work account on Thunderbird desktop that contains some simple text formatting and a logo image, but pasting the same HTML into the signature setting in K-9 Mail just inserts the HTML as text into the email.
This is actually a stunningly important feature that a lot of mail clients miss. Every organization I work for uses HTML signatures, and I've yet to find a mobile client that will handle that gracefully. If K-9 had the same functionality as thunderbird that would be a huge relief.
I'm looking exactly for the same. I hope Mozilla team would like to update K-9 Mail to support exactly this feature to have similar mail client as Thunderbird
HTML signatures would make this app complete in my opinion. Am sure the addition would make this the ultimate business / personal tool to have. Thanks for a great product.