Mdaemon has a spam filter which uses a score system to decide if a message is spam or not. Adding an address to the whitelist lowers the score, making it less likely do be labeled as spam. The blacklist does the opposite, and adds to the score, making it more likely to be labeled as spam. Neither list makes the decision absolute, they adjust the score to increase the probability.

Mdaemon has a spam filter which uses a score system to decide if a message is spam or not. Adding an address to the whitelist lowers the score, making it less likely do be labeled as spam. The blacklist does the opposite, and adds to the score, making it more likely to be labeled as spam. Neither list makes the decision absolute, they adjust the score to increase the probability.