Free antispam service for pop, Yahoo, and Hotmail accounts supporting multiple languages.

Virus scanning and spam prevention based on blacklists and user feedback.

An email security company offering hosted spam and virus protection and a scanning engine especially for OEMs. Also offers Exchange hosting.

Online Spam and Virus Filtering, filter before mail reaches your computer.

Whitelist-based service that automatically "cleans" mailboxes of unwanted email multiple times per hour.

Provides spam-proof email accounts. Only allows email from addresses in whitelist. Charges a fee for others to reach the customer's mailbox.

Managed enterprise quality spam and virus filtering service.

Hosted service filters spam and viruses before they reach your network. This type of filtering can increase security, save bandwidth and reduce the load on your email server.

UK based provider of email filtering, email monitoring and centralized administration services for business users.

System of clients and servers that collect and count checksums of email messages in order to detect and filter bulk UCE.