[patio11]

MailChimp. Two cents an email (one cent if you buy them in blocks of $1,000 or more), not exactly ideal in terms of customizability (corner me online if you want the full spiel) but easily adequate for the "baby's first drip campaign" use case. They're also super-sensitive about spam which is great for you as long as you're so squeaky clean the sight of your smile could blind people at midnight during an eclipse.

[tronathan]

I looked carefully at MailChimp but I didnt see anything about being able to set up "Drip Campaigns" where people will get messaged using a predefined set of emails at given intervals after an event (such as a signup on a website). That's the secret sauce that I'm looking for - being able to add people to predefined workflows using an API and ideally push them down different paths, such as "Purchased" or "Didnt purchase after 60 days", so I can market to them more specifically and in an automatic way. This is what I meant by "Drip Campaign"

[patio11]

The magic word you're looking for in their documentation is Autoresponder. With the API, you just have some sort of state tracking field (I think they call them "Columns") and then segment the main list such that particular autoresponders go out to people who match a particular column value at N days past signup.

Make sense?