If your emails are being filtered they are likely being treated as spam by your contacts' email clients. To reduce your spam complaints and the likelihood of your email being bounced or filtered, try the following:

• Do not use spammy words such as: Cash, Degree, Lottery, Diet, Foreclosure, Debt, Money, Sex, Free
• Avoid these phrases: reverse aging, compare rates, free installation, auto email removal, free, online pharmacy, get paid,
• Do not write in ALL CAPS
• Do not use sporadic or excessive punctuation (!!!!!!!, ???!)
• Do not replace words with symbols (C@$H 4 Clunk3r5)

For further information, check out the links below:

• This article gives a lengthy list of words and phrases that are perceived as spam by email filters. Spam Filters: The Truth About Email Marketing Gatekeepers.
• This blog post on How to Reduce Spam Complaints tells you exactly that. It is a condensed version of the above article with helpful bullets that take you step by step to improve your campaign.
• This page from our Complete Guide to Email Marketing focuses on building your reputation with your subscribers. It discusses how to avoid spam traps and hard bounces.