When you email a newsletter, are you sure it actually gets seen by your recipients? Did you know that up to 46% of all permission-based emails are blocked by over-zealous ISP's spam filters.

So even when people subscribe to your newsletter - it may not even reach them. Most filters spot when the same message is being pushed to many of their customers, but also the language you use can have an adverse effect on whether your message is allowed or blocked.

I came across this website which will test how likely your eNewsletter is to be treated as spam. It gives you a spam-rating and suggests ways you can improve that rating. And it's free - at the time of writing.

http://spamcheck.sitesell.com/