Mail Frontier Matador is a completely customizable software designed to protect your email from more than just spam. Anything that poses a threat including spam, viruses, fraudulent emails, directory harvest attacks, or any policy violations will be blocked. It is also designed to be compatible with any email clients.
Mail Frontier Matador has a retail price of $29.95 . Along with its six other techniques to eliminate spam, you can configure the app to send mail automatically to unknown senders. This asks them to identify the amount of kittens in a digital photograph. If they reply correctly they become whitelisted. Automated mailing programs in theory can't.
But Mail Frontier does have its downside it's proven to block 14% of legitimate mail and let 20% of spam through.
