$ ls -lhd /var/spool/mail
 drwxrwxrwt 5 root mail 6.8M Mar 29 12:37 /var/spool/mail

filehost:/mail/inbox      /var/spool/mail         nfs     defaults        0 0

$ ls -lhd /mail/inbox
 drwxrwxrwt. 5 root mail 6.8M Mar 29 12:41 /mail/inbox

/mail/inbox          mailserver(rw,no_root_squash,async,nohide)

mmap_disable = yes
 dotlock_use_excl = yes
 mail_fsync = optimized
 mail_nfs_storage = no
 mail_nfs_index = no
 mail_privileged_group=mail

mmap_disable = yes
 dotlock_use_excl = yes
 mail_fsync = optimized
 mail_nfs_storage = no
 mail_nfs_index = no
 mail_privileged_group=mail

mmap_disable = yes
 dotlock_use_excl = yes
 mail_fsync = optimized
 mail_nfs_storage = no
 mail_nfs_index = no
 mail_privileged_group=mail

mmap_disable = yes
 dotlock_use_excl = yes
 mail_fsync = optimized
 mail_nfs_storage = no
 mail_nfs_index = no
 mail_privileged_group=mail