Local, web-based mail server application. Slurp mails into oblivion!
Universal server
Anti Spam SMTP Gateway
Automatically generate Outlook signatures based on templates and LDAP.
Zentyal is a Linux Small Business Server
The cult-favourite eMail client formerly known as Qualcomm Eudora
An easy-to-use anti-spam email gateway
Reduce misspelled email addresses in your web apps
MOX Bulk Email Sender is free and powerful bulk email sender script
Active Directory password expiration notification tool