3. 10 Tips to Improve Your Email Delivery
1. Ensure your "from" and "to" addresses are not the same. For example if the "from" says email@example.com and you send it to firstname.lastname@example.org it will most certainly be marked as spam.
2. Maintain a Good Text to Image Ratio. It is usually best to not include images at all; however, if you must include images, then take care not to send any image-only emails. Include text also. And optimize your images the best you can.
3. Don't sound like a Spammer! Don't use the word "free" too many times. Don't use ALL CAPS. Don't use lots of colored fonts. Only use one exclamation point at a time. Stay away from words you'd see in spam: Viagra, drugs, porn, guaranteed winner..