Spam Filter Whitelists and Blacklists
The SPAM filter in HelpSpot includes a Bayesian filter that is trained by marking requests as spam. With training, this is a very powerful way of filtering email. However, there are times when you may want to make sure that a particular sender or email header is always marked as spam or always marked as not spam. In HelpSpot we call this the Whitelist (not spam) and Blacklist (always spam).