D. J. Bernstein Internet mail Frequently asked questions   What
types of filesystems are safe for mail?  Answer: qmail's queue,
except for bounce message contents, is crashproof on the BSD FFS
and most of its variants.  Do not use async or softupdates
filesystems. If you do, and if your system crashes at the wrong
moment, you will lose mail. Under Linux, make sure that all
mail-handling filesystems are mounted sync. The same comments
apply to many other popular MTAs. (However, some MTAs are
unreliable no matter what filesystem you use.)  It is safe to
put qmail's queue on a noatime filesystem.  You may encounter
people who dispute one or more of the above statements. Those
people don't know what they're talking about. A rather
spectacular example appeared in February 2001, when someone
wrote hundreds of lines of text in a dozen messages claiming
that my FAQ was ``totally incorrect,'' claiming that the BSD FFS
wrote data to disk in the wrong order, claiming that the BSD FFS
was not crashproof, and claiming tha