Like all software, Qmail can survive only when it keeps up with changing requirements.
Softwareârelated accidents are usually caused by flawed requirements.
Requirement completeness: Requirements are sufficient to distinguish the desired behavior of the software from that of any other undesired program that might be designed. .
To be stupid, selfish, and have good health are three requirements for happiness, though if stupidity is lacking, all is lost.
Software is a great combination between artistry and engineering.