SpamAI filters 99% of spam in single-user mode on Windows. Free. Never expires. Adds footer on received email. SpamAI uses spammer evasions to trip them up. SpamAI immediately flags as [SPAM] misspellings such as vi@gra, invisible images to track you, and many other cloaking behaviors. Email can never be lost since all the email archives retain all e-mail is kept for four weeks on the installed machine.