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I've created a disclaimer for a company which will, in essence be a signature that I will customize dynamically with AD attributes (things like first name, etc.)

The company, natch, has a logo. I'd like to embed the logo in some way so that recipients will see the logo.

Including an IMG tag that references the logo on an outside server will not display the logo, natch, since most email apps (wisely) turn off these kinds of links.

I thought encoding the image with BASE64 wrapped in an IMG tag would work. Indeed, the logo does render when I plop the encoded image an HTML page. However, the Base64 encoding and remainder HTML code is way beyond the Transport Rule 2048 character limit.

Is there another way?

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My first reaction is - don't Yeah, it's just bits, there's no real cost to disclaimers, but they're a waste of space as it is (I've got one company I deal with that has a 5-line disclaimer twice because they have it in French and English (Canadian company)), and now you want to put an image in there, too? You're gonna be sending 20kB messages just to say "Hi"! And, of course, you don't know how it's going to render for every receiver: I get all my email strictly as text... –  Ward Oct 10 '12 at 22:34
What Ward said. Plus, many people (including me) configure the MUA to prefer text/plain over text/html, so we won't see any images in email. –  Philip Oct 10 '12 at 22:36
You guys are speaking truth. I'll likely just stick a plain IMG tag and set their workstations to display the logo. I also think I can explain why we can't guarantee the disclaimer will display exactly the same way across platforms. Still, we're sysadmins. We know terms like MUA. We display plain text. It's no big deal to us. Average folks see signatures with logos and they want that. So, it's hard to argue for what's right sometimes. –  tcv Oct 11 '12 at 13:02

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