I've seen a few recommendations for Mailchimp, and I'm wondering if anyone else has used Sailthru ( http://www.sailthru.com http://www.sailthru.com ). We've bee

I've seen a few recommendations for Mailchimp, and I'm wondering if anyone else has used Sailthru ( http://www.sailthru.com http://www.sailthru.com ). We've been using them at zootoo.com for well over 2 years, both for transactional emails and campaigns, and have been extremely happy. They're also way ahead of Mailchimp and other email SaaS providers with their Horizon customer tracking tool that enables customized newsletters based on the individuals browsing habits (Horizon is in beta right now but has been written about in the press). Full disclosure - I know the owners personally and have worked with them in the past, but that doesn't take away from how awesome the product is.