/var/qmailThis is the qmail home directory. It must be a local directory, notshared among machines. This is where qmail queues all mail messages. The queue (except for bounce message contents) is crashproof, if thefilesystem guarantees that single-byte writes are atomic and thatdirectory operations are synchronous. These guarantees are provided byfixed-block filesystems such as UFS and by journaling filesystems. UnderLinux, make sure that all mail-handling filesystems are mounted withsynchronous metadata.