1. Create a unique subject title
In your e-mail subject line, include something unique such as your club name.
2. Avoid trigger words
Spam filters are more likely to reject an email if it contains any of the following words in the subject line (or even in the body of the text): Business, Cash, Cheap, Congratulations, Credit, Deal, Discount, FreeGuarantee, Obligation, Offer, Opt, Opportunity, Outstanding, Payoff, Price, Promo, Promotion, Rate, Refund, Sales, Save, Shop, Spam, Spree, Subscribe, Win, Winner, Winning, and Won. Make sure you steer clear of them.
Avoid the use of background colors, large or unusual fonts, or more than one font. In other words, don't make your email look like an advertisement or a brochure. Put the emphasis on content rather than trying to dazzle the recipient with special effects.
4. Use graphics sparingly
Many spam filters assume that any message that contains more than one or two small graphics is probably adult content and will block it.
5. Limit the number of URL links
Spam filters are wary of link-laden messages because spammers tend to scatter links around their messages, hoping that the reader will click on at least one. A better approach is to have the "next step" be a return email--but if you want the the recipient to click somewhere, have only a single link, placed prominently. Obviously, none of the above guarantees your email won't get filtered out, but it does increase your chances. Needless to say, the content should be short, sweet, and to the point. There's little point in getting through the spam filter if the email doesn't communicate to the person who's reading it.
6. Use a Spam Checker
You can use a free online Spam Checker to see if you're email contains any of the spam filter triggers.