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Double opt-in (also called “confirmed opt-in”) can help to prevent list hygiene problems, but some people are dead set against it. I’m not going to change their minds. I’m not even going to try to. But I’ve seen some changes at Gmail lately that lead me to think that I’m doing the world a disservice if I don’t at least warn you: If you’re a small newsletter publisher or small marketing sender, if you’re anyone using an SMB-focused or shared resource focused email sending platform, you’re putting yourself at risk by not employing double opt-in.Recently, a number of us in the email deliverability space started to hear that a bunch of smaller email senders, ones that were otherwise doing just fine yesterday, were suddenly finding their mail going to the spam folder in Gmail mailboxes today. Diving into it, this was all specific to a certain email provider, and was