I'm considering adding email addresses to a marketing web app. Currently users are able to sign up and get a subdomain address that they can choose (theychoose.domain.com). So I'm thinking of also offering [email protected] for an email address they can use.
I've pretty much decided on sendgrid.com for sending email through the web interface which takes care of a ton of sending headaches. I'd also like to avoid setting up an email server if I could so I'm looking for services that allow me to set up an account and then programmatically create addresses when a user signs up. I want to find a service that will deal with all the spam filtering etc.
Also, this probably makes no difference but it's a Rails app.