Winmail Mail Server 

Winmail Server is an enterprise class mail server software system offering a robust feature set, including extensive security measures. Winmail Server supports SMTP, POP3, IMAP, Webmail, LDAP, multiple domains, SMTP authentication, spam protection
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602LAN SUITE 

Secure mail server with anti-virus & anti-spam, built-in firewall with NAT and real-time web content filter proxy for controlled Internet sharing. Access your e-mail anywhere using the included web mail client. The 5 user version is FREE.
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FTGate 

FTGate4 is a powerful Windows mail server with comprehensive Groupware functionality. Features include calendaring, contacts, IMAP, anti-spam , anti-virus support, multiple domains, Web Administration, WebMail, instant messaging, SPF,SSL + more.
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GFI MailSecurity for Exchange/SMTP 

GFI MailSecurity for Exchange/SMTP is an email content checking, exploit detection, threats analysis and anti-virus solution that removes all types of email-borne threats before they can affect an organization?s email users.
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AntiVirus for MDaemon 

AntiVirus for MDaemon offers total email protection and an unsurpassed ability to detect, detain and delete infected Emails. AntiVirus checks daily for signature file updates and free urgent update notifications concerning new serious threats.
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MailEnable Enterprise Edition 

MailEnable Enterprise Edition is designed for organisations or ISP's dealing with high volumes of mail, requiring greater control and flexibility over mail services.
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