As a user who generally only reads emails in plain text, I can't tell you how annoyed I'd be if someone sent me a plain text email with a signature full of html.
Even on the rare occasions when I do read HTML mails (eg when the sender can't be bothered creating a proper plain text part, or thinks it is appropriate simply to put a one-line placeholder in the plain text) I would not have fetching of remote images turned on ... so an email meant to contain a logo image is going to be wasted on me ... and everyone else who disables such fetches.
Surely what you should be doing is putting a simple plain text signature into every mail - regardless of whether it is a plain text mail or a rich text one?
If you must have a corporate logo in the mail, I don't see that the signature is the right place for it. Wouldn't it be better at the top of the mail?
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