How easy is it to set up a drip campaign in Express Pigeon? How easy is it to add new members of a list to an already in progress drip campaign?

It's super easy to setup a drip campaign (we call these autoresponders) based on a trigger. We have a number of triggers, but one you might be interested is subscription via a webform. When a person subscribes using such form their email is added to a configured list and an autoresponder triggers. Autoresponders can send a number of emails to subscriber spaced out in time.