Five HTML E-mail Design Tips, Part 2

5. Test the message. Most formatting issues can be fixed before the message is deployed, so it is imperative that you run a number of tests prior to deploying the message.

Set up e-mail addresses at the major ISPs and e-mail a test version of the message to yourself. Or, use a third party to perform these tests for you. This will expose a large percentage of the issues in advance.