CSS font stacks & developer FAQs with Web standards
We love social media, but we do not expect you to create yet another public outpost on the Web.
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A: The first (un-helpful) response is that email is a plain text medium and sending other MIME types is bound to be a problem for some users. One of the great advantages of email is that it is lightweight and usually takes a fraction of a second to download. If you include surplus HTML markup and perhaps image references you will significantly impair the user experience and turn subscribers away from your service, either by deleting the mail without reading or un-subscribing.
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What are the guidelines for HTML formatted email?