Extensible Messaging Platform Anti-Spam Filter 5.5
Server based Anti-Spam Filter protects organizational mail servers (Exchange Server, Novell GroupWise, Lotus Domino, Sendmail, etc) from spam, email-borne viruses (including dangerous auto-launch viruses) and objectionable content using contextual pattern signatures (not simple keywords). The use of contextual signatures results in high success and extremely low false-positive rates.

BusinessMail Email Server + Anti Spam System 4.70.00
BusinessMail 4 is a powerful multi threaded Intranet/Internet email server and a powerful anti-spam systems with windows Service option, designed specifically for the business environment. It can be installed on any W95/W98//ME/W2K/XP or NT4 PC. BusinessMail 4 offers single/multiple email domain support, can be run as a windows Service, fully user configurable scoring anti-spam system, user & domain aliasing, powerful routing/filtering, flexible connection scheduling and much more.

No Spam Today! for Servers 3.1.5.1
NoSpamToday is an e-mail spam filter (SMTP/POP3) compatible to every known mail server software. NoSpamToday includes the award-winning SpamAssassin filter, an attachment blocker, and an RBL filter. 3rd-party virus scanners can be easily integrated into the filtering pipeline. Traffic limiting protects your mail service from flooding or directory harvest attacks. Statistics and reports are available in real-time.

No Spam Today! for Servers Freeware 3.1.5.1
NoSpamToday is a e-mail spam filter (SMTP/POP3) compatible to every known mail server software. NoSpamToday includes the award-winning SpamAssassin filter, an attachment blocker, and an RBL filter. 3rd-party virus scanners can be easily integrated into the filtering pipeline. Traffic limiting protects your mail service from flooding or directory harvest attacks. Statistics and reports are available in real-time.

No Spam Today! for Workstations 3.1.5.1
No Spam Today! for Workstations was created for users of Outlook, Outlook Express and all other POP3 email clients to protect mailboxes against spam, malicious attachments and viruses. Acting between your mail client and your mail server No Spam Today! for Workstations scans all incoming emails and marks spam emails so you can sort out the unwanted emails.

VisNetic MailServer 9.1
VisNetic Mail Server is a versatile multi-featured mail server for Windows operating systems. VisNetic Mail Server can be licensed for any size organization as well as ISP and ASP environments. VisNetic Mail Server combines a simple, easy-to-use administration console with unmatched mail server security, speed, and scalability. VisNetic Mail Server features support for Sender Policy Framework (SPF) and Spam URI Realtime Blocklists (SURBL).

GFI MailEssentials for Exchange/SMTP 14
GFI MailEssentials is a server based anti-spam, anti-phishing and email management solution for Exchange/SMTP used by 80,000 customers worldwide. This solution uses two anti-spam engines to ensure a high capture rate and is available at an unbeatable price. With GFI MailEssentials, spam is caught before reaching the mail server, eliminating the need for client software. It also blocks phishing emails and adds email management tools to the server.

Mail Server Pro 3.11
Mail Server Pro is a bullet-proof SMTP POP3 server software used by corporations and Internet Service Providers as an ultra fast and reliable mail server. It is simple but powerful; it has a lot of security features and options to prevent DDoS attacks and block SPAM. For software debugging and testing purposes, the program has a testing mode. It is also ideal for laptop PC users who travel a lot and have to use different ISP on the run.

UserGate security server 4.3
Protect your network with UserGate Internet security server, designed to allow Internet access to be delivered safely and securely across your network. Prevent your LAN and/or Intranet users from accessing inappropriate web resources with UserGate's flexible sets of rules. Ensure that your user's computers receive only traffic that is clear of spam and viruses by using UserGate's powerful combination of dual-core Panda and Kaspersky Antiviruses.

mxORB 2.3
mxORB is a server-side spam filter that consistently blocks over 98% of unsolicited commercial email (also known as spam) at a fraction of the cost of other filtering solutions. mxORB is packed with all of the features you will need to eliminate spam. The amazing low price coupled with a success rate of over 98% gives it an unassailable position in today's marketplace.