An Opt-in email refers to an email that is precisely demanded by the recipient.
What an opt-in email means has been a hot topic since the beginning.
“Single opt-in” vs. “Double opt-in”
The phrase single opt-in refers to the efforts taken for signing up for an email. The term double opt-in refers to the event when the subscriber steadily confirms their consent by acknowledging an automated message received at their email address. Advocates of double opt-in may not utilize the term, as they might think that every email identified as “opt-in” must be tested.
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