Pegasus Mail is the oldest email client on the market and has just celebrated its 25th anniversary.
Pegasus Mail has all the features you would expect from an email client: English spell check, a spam filter, strong protection against viruses, and support for SMTP, POP3, IMAP4, LDAP, and PH.
You won’t notice its age when you use it. It is very solid and well engineered, and the developer, David Harris, has said he is rewriting parts of the code so it meets today’s standards. That way, the oldest email client stays completely up to date.
Pegasus Mail is a free, well-developed mailprogram that dates back to 1991.