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ActionMailer, HTML emails and DOCTYPE

I noticed that the examples in the Rails 3 Action Mailer Basics guide use HTML5 doctype tag <!DOCTYPE html> for HTML emails. Older Rails 2 guide examples use Transitional doctype. As far as I know, HTML emails must use the most basic, old-style HTML code with some deprecated tags, so various email clients display it properly. This suggests to me that doctype should not be used at all for this purpose. Am I wrong or does doctype really serve some use in this case?

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