Bluebottle - Free Anti Spam Email
Free spam-protected email with 250MB of storage, POP3 and web-based access and outgoing SMTP. Bluebottle only accepts emails from trusted senders making your email spam-free.
http://www.bluebottle.com

FastPCNet : Spam and Virus Filter
Offers redundant spam and virus filtering service with spam filters located in carrier neutral data centers in different regions of the country.
http://www.fastpcnet.net/spam-blocker.html

SAFEnSOUNDmail
Safe email for children, helping families keep safe online. Reliable family email with flexible parental controls. Stop spam, ads and unwanted mail.
http://www.safensoundmail.com