1. Easy Set-up and Management. Your ideal service will be easy to use, maintain and configure, with enough options to give you what you need from the very beginning. Be sure that there's adequate customer service and support available to you when you need it.
2. "Smart" Tracking Features. This is mandatory feature, enabling you to know instantly which autoresponders and messages are pulling in the most, as in direct marketing you really need to be able to track everything you possibly can. This way, you can easily figure out which offers and messages are working the best and eliminate the ones that aren't performing.
3. Database Access. The ability to access and manage your database of prospects is imperative to any successful e-mail marketing plan. You should be able to add subscribers, view removals, update messages, etc. 24 hours a day, 7 days a week (when it's convenient for you, not your service provider).
4. The ability to "get it in". Messages from many e-mail marketing solutions will have a tough time getting through ISPs, let alone staying out of the "bulk" folder. The best email campaign on the net won't do anyone any good if it gets deleted before it can be read. Ensure that any prospective solution actually gets a high percentage of messages through to recipients.
Of course there are other features you'll certainly want, like CAN-SPAM compliance (to keep you and your autoresponder out of legal trouble), SPAM-Check (to analyze your message and tell you how to improve it so your message gets to the recipient's inbox, not their bulk folder), and the ability to attach files to your messages. While these special features might not seem critical to you now, one day in the future they may just be a necessity, so be sure that your e-mail service can expand to meet the needs of your growing business.
Stewart Hayden recommends that you visit http://www.getresponse.com/ for more information on email marketing.

