Is it spam? Know before you send
How do I … determine if my e-mail message will land in a spam filter?
People who devise newsletters, special brochures or end-of-year family letters need to know if that work might end up in the spam filter of their intended recipients.
One option is the SiteSell spam checker at spamcheck.sitesell.com.
It uses a traditional content analysis tool to look at the components of any e-mail or attachment, then figure out its likelihood of being considered spam.