Do all modern email clients (online and desktop apps) support MHTML email content in which images and other resources are embedded in the email?
In addition is this the standard that should be used to get a consistent HTML email message out or is it better to send HTML emails with linked resources.
Note: I am aware of the 7 reasons why HTML e-mail is EVIL but it is essential in this case. Also I have seen the article on css support in HTML emails and know these pitfalls.