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The logical location for this directory was changed from /var/spool/mail in order to bring FHS in-line with nearly every UNIX distribution. This change is important for inter-operability since a single /var/mail is often shared between multiple hosts and multiple UNIX distribution (despite NFS locking issues). ref: https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch05s11.html
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