| Red Condor
Stops spam before it reaches your network. Managed spam filtering service blocks spam, viruses, spyware, and phishing schemes. A 30 day free trial is offered. |
| RMX - SMTP anti-forgery protocol
Filtering protocol verifying the sender address through authorization records made available in DNS to prevent address forgery. |
| Securence
Managed spam service offering Anti Spam and Anti Virus filtering technologies. |
| Sender Policy Framework (SPF)
Framework for publishing information through DNS describing a list of ip addresses allowed to send emails from a specific domain. |
| SODA3
Mobile email filtering service for POP3. Filters your view of your mailbox so you only see email from important senders on your mobile device. |
| Sophos PureMessage
Email management solution that provides full control over security and usage of corporate email systems. |
| Spam Arrest, LLC
POP3 service that blocks spam using sender verification methods. |
| Spam Cop
Spam reporting service. |
| The Spam Eater
Checks your existing POP3 email account every ten minutes and filters spam and viruses. A 30 day free trial is offered. |
| Spam Filtering for Mail Exchangers
Document offers detailed discussion on how to filter junk mail in incoming SMTP transactions. |