[plug] Exim mailbox relocation.

[Craig Ringer]

> Your best bet in this situation is to export the directory on the 80gig
> drive, and mount it on the mail machine as /var/spool/mail or
> whatever...
>
> All the usual cautions about cross-mounting mail spools (and other
> important directories) applies.

You no longer need that kludge, just bind mount the directories - no NFS 
required.

mount -o bind /mnt/80gig/var_spoool_mail /var/spool/mail

for example.

2.4 kernel needed but I doubt that'd be a problem.