From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christopher Chan <chrisfz@netvigator.com>
Subject: Re: Which version will be merged into mainline kernel?
Date: Tue, 14 Nov 2006 13:54:03 +0800
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> So the bad case is:
> 1. mails are tiny
> 2. RAM cache is big
> 3. cache doesn't get flushed to disk for 1000s of mails
> 4. crash happens seldomly, but severely :)
> -> 1000s of mail lost by the crash
> 
> Now I see :)

:). So fsync/fsyncdata takes care of those rare crashes which is why 
mail servers should rarely lose mail. I say should because the journal 
mode available/used affects fsync/fsyncdata too.