multiple mailscanner instances?

[Eric H]

OK, if I'm understanding the process correctly then one instance of
sendmail listens and deposits mail in /var/spool/mqueue.in/ then
mailscanner picks it up and scans it and deposits it in
/var/spool/mqueue/ and then the other instance of sendmail picks it
up and transfers it or hands it to procmail for delivery.

So, would it not be possible to run multiple instances of mailscanner
in order to increase the rate at which mail is picked up from
/var/spool/mqueue.in? Would they step on each other? Would there
be a performance benefit? Seems to me that on a dual processor machine
it would.

What's the /var/spool/MailScanner/incoming/ directory for?

Eric