Spamina

Spamina provides mx services and mail filtering.

Altospam

Antispam and antivirus software on Cloud

Managed DNS, Outsourced DNS & Anycast DNS

Happy Moose is a super-efficient cloud anti-SPAM solution for organizations. It stops up to 99.

MXSAVE is an email disaster recovery service that works seamlessly with on-premise or hosted anti-spam solutions.

MailRoute is a secure, hosted email filtering service that you can have up and running in minutes without any hardware or software to install.

Postgrey is a Postfix policy server implementing greylisting developed by David Schweikert.

SMX – Cloud-Based Email Security.