# never: Never use it (best performance, but crashes can lose data)
#mail_fsync = optimized
-# Mail storage exists in NFS. Set this to yes to make Dovecot flush NFS caches
-# whenever needed. If you're using only a single mail server this isn't needed.
-#mail_nfs_storage = no
-# Mail index files also exist in NFS. Setting this to yes requires
-# mmap_disable=yes and fsync_disable=no.
-#mail_nfs_index = no
-
# Locking method for index files. Alternatives are fcntl, flock and dotlock.
# Dotlocking uses some tricks which may create more disk I/O than other locking
# methods. NFS users: flock doesn't work, remember to change mmap_disable.