MailEnable Professional 

MailEnable Professional Edition is a enterprise level mail server for Windows 2000/NT/XP. It supports SMTP and POP3, supports an unlimited amount of email addresses, domains, groups and mailing lists.
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MailEnable Standard 

MailEnable Standard provides robust SMTP and POP3 services for Windows NT/2000/XP/2003 systems. Simple installation procedure and powerful administration tools means that you will be up and running quickly. FREE for personal and commercial use.
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MailList King 

With MailList King you can use your favorite e-mail software (Microsoft Outlook, Outlook Express, Eudora, etc.) as a Mailing List Server, so you can easily create, manage and communicate with a list of people interested in your web site or products
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AXIGEN Mail Server 

AXIGEN is fast, reliable and secure mail server on Linux, offering (E)SMTP, POP3, IMAP4 and WEBmail services, with centalised Web/CLI Admin and FREE support included, enabling the System Administrator to have full control of the email traffic.
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