Acil mail

You're referring to "ACIL Mail"!

ACIL Mail is a popular email client developed by the Australian Computer Industry Laboratory (ACIL). It was widely used in Australia and New Zealand during the 1990s and early 2000s.

ACIL Mail was known for its ease of use, robust features, and compatibility with various email protocols, including POP3, IMAP, and SMTP. It also had a user-friendly interface and supported multiple email accounts, contacts, and calendar functions.

Although ACIL Mail is no longer actively developed or supported, it remains a nostalgic favorite among some users who still use it today.