MailBell 

MailBell is a utility that checks email on POP3, POP3-SSL, IMAP, IMAP-SSL, MAPI and Hotmail-Email accounts. It can notify you of new mail, can detect undesired messages and lets you delete mail with large attachments without downloading it.
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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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ANT 4 MailChecking 

E-mail checker that lets you know when you have new emails. You can preview headers and messges or delete spam mails directly from the server. It's very easy to set up and use. It even comes with an option to shutdown your PC by email.
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VisNetic MailServer 

VisNetic Mail Server is a high performance mail server with an extensive, highly configurable feature set. This secure mail server is also ideal for use as a gateway mail server, features built-in anti spam, Web mail and an instant messaging server.
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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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Aspose.Mime 

Aspose.Mime is a .Net Email parsing component for building email solutions. It can be a core of any email receiving solution, like POP3 and IMAP.
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