Double opt-in exists...but their API, rightfully, allows for some rule bending. Mailchimp trusts at least one of its integrations to confirm the subscription.

Double opt-in exists...but their API, rightfully, allows for some rule bending. Mailchimp trusts at least one of its integrations to confirm the subscription. One thing that is hugely bothersome is that it's not possible for us to collect email lists at conventions and send to then through mailchimp. Bad handwriting and/or fake email addresses resulted in a warning from mailchimp about a 22% bounce rate from a list we collected by hand. I'm not impressed with the mailchimp WYSIWYG either. It's buggy with their templates and the plaintext is always absurd. The A/B testing is nice, though.