subscribing

MailChimp had no answers online

If people send e-mail to a designated e-mail address (such as the lists from address), they should be able to be automatically invited to join the list.

My interpretation of their response: I should make a Drupal module to do that.

Actual response:

Hello Ben!

It's nice to virtually meet you! That's a great question and we’re happy to get it answered for you!