>I do believe that my network was sniffed though as I found records of
>multiple port scans in my VPN concentrator and PIX firewall's log files.
FYI, that's not uncommon.
And, if you think *is* the cause, you should be very scared right
now. Because if a hacker performed a port scan on your network, and then
got a sniffer installed -- that means they broke into one of your computers.
>The only other possibility that stands out is that one of the employees
>is using our e-mail at home and somehow or another intentionally or
>inadvertently divulged his password information.
That's possible, but very few spammers go to that much effort when it is
easy to find an open relay to abuse.
Did your logs show that the spammer was indeed using one of your
accounts? Did you check to see which one?
-Scott
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