A mail transfer agent (MTA) software for Unix systems, designed as a secure and reliable alternative to sendmail. Known for its modular architecture and security features.
Created in the 1990s by Dan Bernstein, the 'q' likely stands for 'queue' (referring to mail queuing) while 'mail' is self-explanatory. The name reflects the software's focus on efficient mail queue management and delivery.
Qmail was revolutionary for its security-first design philosophy, using privilege separation decades before it became standard practice. Dan Bernstein offered a $1000 reward for anyone who could find a security hole in qmail - a reward that remained unclaimed for years, testament to its robust architecture.
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