I like Vertical Response, especially since it can track ROI, and has seamless Google Analytics integration.
Another great thing is that you can send direct mail postcards for about 90 cents each, including printing, shipping, and handling!
Also, with the new Web Hooks feature, you can setup Shopify to automatically export to Vertical Response though API integration.
You could use WrapMail to include all of your Shopify information which would go out with every email you send. If you are 4 users or less it will cost you $20 per month. WrapMail also has a free service.
Thanks for the great suggestions guys, wrapmail is interesting, I’ve been wary of Vertical Response, but if they integrate with Google and direct mail, its worth another look. CampaignMonitor also looks like a great fit for me, and most of my clients—powerful, sleek, and no monthly fee! yay!
I’ve tested and used several of these, these are my favs, in order:
1. Campaign Monitor/Mailbuild
4. Vertical Response
I looked for ease-of-use, template control, list management, an API, and friendly folks (you’ll inevitably need support at some point).
Try a few out before you buy.