How to reduce effect of SMTP swamping??

["kbajwa" <kbajwa@tibonline.net>]

Hello:

We are under attack with SMTP swamping. One person was kind enough to send
me a direct email suggesting that I change the following setting in
"/etc/var/control":

concurrencyremote  = 5
concurrencylocal = 250
concurrencyincoming = 300

After changing these setting, I do not see any change. We have many, many
experts on this list, therefore, I ask; what are the best settings to reduce
the effect of SMTP swamping? Can we change the above setting so the incoming
mail is slowed and our clients outgoing mail keeps being sent?

Thanks.

Kirt