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If you are not sure about the exact definitions of the various levels of opt-in when it comes to building email marketing lists or other types of email lists, here is a quick review of what each of them mean. Because there is some confusion about what each of them means, especially where one method of list-building may have more than one name, we've created this resource explaining the generally accepted definitions of Double Opt-In, Confirmed Opt-In (COI), Single Opt-In, Opt-In, Opt-Out, and Transactional email for you.  These are the definitions that the inbox providers, ISPs, and spam filters use, and so it's important for you, as an email sender, to know them.
I recently had the pleasure of working with journalist Karen Bannen, on an article that she was doing for BtoB Online. Karen interviewed both myself and R. Dave Lewis for the piece, in which she distilled down to their essence 5 ways to improve your email deliverability.
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It's important not to confuse email marketing best practices, and email best practices in general, with email "common practices". In fact, this can be a very dangerous, slippery slope on which to pin your email deliverability and indeed your email reputation. In fact at one point in time there was a meme going around suggesting exactly that, that it's "important to follow email marketing common practices." No, no, NO! To suggest that best practices aren't really best practices, but only 'common practices', reduces them to "not necessarily required" practices.
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