Al DiGuido has posted a good article over at ClickZ with recommendations for selecting an e-mail delivery service provider.

There is a checklist of questions you can use when evaluating vendors but many of these are not going to be within the reach of small business.

The most important recommendation in my opinion:

Do you homework – read reports from research firms, talk to analysts, get referrals from trusted sources, ask for references and review the service providers IP addresses to see if they are keeping the off the blacklists.