Coding HTML emails can be a pain. Outlook uses Microsoft Word to render HTML emails, CSS support is very poor and there's lots of tips and tricks and things to avoid.
I found an online service: http://emaillint.com/ but a linter for code editors would be a brilliant thing.
I don't know how to go about creating a Linter for Atom, but if someone else created it I think I'd be able to open pull requests with additional rules to make it better.
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