Does SpamCheetah lose legitimate mail?
False positives or legitimate mails being misclassified as spam is a problem caused by content scanning. Since SpamCheetah does no content scanning SpamCheetah can never lose e-mail. However SpamCheetah does rely on blacklisting of IP addresses that send mail. So if a legitimate mail sender IP is blacklisted then theoretically you could lose mails sent from that IP address. But e-mails are retried by MTAs that adhere to RFC standards. The blacklisting done by SpamCheetah is also valid only for 24 hours. So this seldom occurs in practice. In short, you shall never lose a valid e-mail with SpamCheetah. However there can be a delay of a few hours.
