1 /var/qmail

     2 

     3 This is the qmail home directory. It must be a local directory, not

     4 shared among machines. This is where qmail queues all mail messages. 

     5 

     6 The queue (except for bounce message contents) is crashproof, if the

     7 filesystem guarantees that single-byte writes are atomic and that

     8 directory operations are synchronous. These guarantees are provided by

     9 fixed-block filesystems such as UFS and by journaling filesystems. Under

    10 Linux, make sure that all mail-handling filesystems are mounted with

    11 synchronous metadata.