I notice that salesforce seems to simply append the username and password at the end of the template, as far as anyone is aware are the resulting documents always well formed and reliably rendered across all email clients?

Attribution to: Baxter

Possible Suggestion/Solution #1

Yes, we have tested Text and HTML with Letterhead extensively and they all render fine in various email clients. If you were to create a raw html template or a visualforce template, I believe that the username/password is placed outside of your markup which can cause some unintended layout issues. Stick to Text or HTML with Letterhead and you should be fine.

Attribution to: Kevin O'Hara
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