David Harris - ( Freeware)
Pegasus Mail is a highly customizable software email that offers protection against viruses and Trojans too.
Pegasus Mail is an e-mail client that runs on computers using Microsoft Windows, interacting directly with the user, for sending mail, reading, printing and other manipulation through a graphical interface. Small and fast, Pegasus also offers powerful tools to inform the user when a new message arrives. It can send and receive Internet mail using standard protocols (SMTP, IMAP and POP3).
Regarding the security, Pegasus Mail comes with a powerful Bayesian spam filter and it offers complete protection against viruses, Trojans and phishing.
New OpenSSL build: This version includes OpenSSL v1.0.2n, a recent release with numerous fixes and with new capabilities such as support for Perfect Forward Secrecy.
Security fix: A DLL load order bug reported by security researcher "hyp3rlinx" has been fixed.
Completely updated Help system.
Updated HTML rendering components.