Dr. Ralph F. Wilson gives us "20 Ways Opt-in E-Mailers Can Outsmart S**m Filters" An overview is included here. Visit this web page to see full details of each point:

1. Avoid E-Mail Software or Listservers Used by Junk Email Senders
2. Use Capitalization Carefully
3. Keep HTML Simple
4. Watch Your Hyperlinks
5. Use Color Judiciously
6. Use Large Fonts and Characters Judiciously
7. Avoid Suspect Junk Email Phrases
8. Be Careful with Subject Lines
9. Carefully Word Your Method for Removing a Name From Your List
10. Flaunt Being a Newsletter
11. Use a Signature
12. Don't Mention "Monty Python's Favorite Processed Meat Product" Law Compliance
13. Message Size of 20K to 40K Helps
14. Remove Junk Email Flag Addresses from Your List
15. Monitor Your "From" E-mail Address for Challenge Systems
16. Ask Subscribers to Put Your Address in their "Whitelist" or Address Book
17. Monitor Blacklists and Test Accounts
18. Move Immediately to Confirmed Opt-in
19. Use the Habeas Header If You Qualify
20. Use a Junk Email Checker to Test Your Message
View Posted by: DTB at 2:37 PM  |  Permalink