The one problem I see with this approach, from a strictly mail standpoint, is that you may not have enough control over the image size. Large images, generally over 32K in fact, can trigger SPAM filters on many inbound mail servers. This can delay or prevent delivery of email.

We keep our images small, and the HTML or text signature is insignificant. Of course, it limits the text portion to use of universally available fonts, but this is rarely an issue.

Glenn
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Actually I am a Rocket Scientist! \:D