2. Use ASCII Text Only
Keep it simple. Include lots of white space in your messages. Use headlines and sub-headlines. Don't overuse WORDS IN ALL CAPS. Make it easy to scan and to read.
3. Use Wide Margins
Limit yourself to 50 to 80 characters per line.
4. Deliver Your Most Important Information first
Try to always put your key benefits and sales points in the first screen people read or risk losing your chance to make your case.
5. Make The Subject Line Your Headline
This is what people see first. If it's strong, crisp, and compelling, they'll open your email. If not it will get "recycled" so concentrate on this all-important element.
6. Short Is Better
Unlike other kinds of sales writing where long copy outsells short copy, the standard for email is different. Think about the way you sort through email, especially when you have a backlog of messages. Online, time is often too short.
7. Test, Test and Test again
Gauge your response by testing one element of your email at a time. Start with the subject line. Test headlines, body copy, layout, and the PS. at the end. Successful marketing copy is always tested, one element at a time.
8. Always Give Readers a way to Opt-out
What's interesting today may become annoying to a reader in the future. Always give your reader an easy way to epxclude themselves from future mailings, and by all means honor that request.