Some common email filtering packages examine things like HTML styles, text formats, gaps in text, use of all caps, and other features common to spam.
Mailers have some control over the effect of filters on their messages by avoiding words that trigger filters.
However, content that triggers spam filters is not always obvious, which is why you need to test with a pre-campaign monitoring tool ( like Emailgarage's SpamCheck ) to see if there is content that you were not aware of that would get caught in spam filters.
Conclusion – Test your email on common spamfilter rules with the SpamCheck.
source:Returnpath.biz
