Test Mailer enables you to quickly send an email and monitor or debug all communication with the recipient mail server. There is no need for a smtp server, Test Mailer will act as a mail server itself and lookup the MX records for the recipient.
VisNetic Mail Server is a multi-featured mail server that will scale to meet the email and instant messaging needs of any sized organization, including ISP and ASP environments.
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
WinWebMail Server - Web Mail Server for Windows NT,2000,XP,2003. Supporting WebMail,S-MIME(RSA,DSS),SMTP,SSL-SMTP,POP3,SSL-POP3,IMAP4,SSL-IMAP4,TLS-SSL,AntiSpam,AntiVirus,BBS,Calendar,CA Server