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Just a tip:
MailScanner picks up files from an incoming area; copies them to a processing area; and upon accepting a message will place it in an outgoing area.
You can speed up MailScanner by using a RAM disk for the processing of data.
MailScanner is written in such a way that the Incoming file won't be removed until it has completely finished processing of it, so using a RAM disk is safe.
In my case on a Debian system I just needed to add the following to my /etc/fstab file:
tmpfs /var/spool/MailScanner/incoming tmpfs defaults,mode=750,uid=102,gid=102 0 0
Where uid/gid 102 is the user id/group id of the user that runs the SMTP server (exim in my case).