[duck]

I highly recommend MailChimp. I use them for my newsletter and the fact you can start using them for free with up to 2000 subscribers is very nice.

[fudged71]

I'm curious more along the lines of personalized emails to users of a service. As far as I know, MailChimp is more about blasting one message to lots of people. Unless I'm mistaken :)

[duck]

Oh, okay. In that case you want to look at transactional email services. MailChimp offers that as well with https://mandrill.com, but there are a ton of other offerings as well like http://sendgrid.com.

[fudged71]

That mandrill site is slick! Thanks for the links