[Skunkworks] Help a SPAM Bomb Victim.. :(

Hey guys, I am running MDaemon and it seems like someone has his spam guns pointed at me. Our server does a domainpop to our ISP, with which we have an account. When I log on to our mailbox at the ISP, I see a ton of junk mail. Our mail server in the office is terribly slow and when I look at the process monitor, I see MSpamD.exe hogging memory like nobody's business. It looks like someone is trying to DoS us... Anything I can do on the MDaemon configs to counter this attack? Kindly advise. S. -- שִׁמְעוֹן