The industry standard is "confirmed opt in".
Lots of people use the term "double opt it". Some of those people are spammers. If someone cares about sounding credible they should probably use "confirmed opt in" rather than "double opt in".
Lots of people use the term "double opt it". Some of those people are spammers. If someone cares about sounding credible they should probably use "confirmed opt in" rather than "double opt in".
I'm not sure why it is not credible to use the term double opt-in, please explain.
That mailchimp blog? It's wrong. What they describe as confirmed opt-in is not confirmed opt in, and what they describe as double opt in is in fact just confirmed opt in.
If anyone from mailchimp is reading: please fix this fucking annoying and stupid error.
EDIT: That constantcontact post is correct. Notice how they put "also known as double opt-in" in brackets, and then never use it again but only use confirmed opt-in?