In a recent article on Clickz, Kirill Popov and Loren McDonald explain why using outdated or incorrect code is a major reason why e-mail are blocked or delivered to bulk or junk mail folders.
How do you minimize or eliminate HTML filtering problems at ISPs?
A few suggestions:
- Make sure your e-mail designer/programmer is familiar with W3C standards
- Before distributing an e-mail, run the message through your design software's or e-mail application's HTML validator, if it has one
- Consider using a delivery-monitoring service to track your messages after pre-tests and full-list distribution
- If your e-mail does get trapped in a bulk folder, check your code and isolate what's causing the filtering