Urgent!!! SPAM

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Hi, We have a global catchall account configured on our
SBS 2000 server which has suddenly this morning started
receiving huge amounts of spam from an SBS 2003 server in
another part of the country. We know the dns name
@spamsender.com which is sending this mail. Can anyone
tell me how to block inbound pop3 mail by domain name
using isa 2000. This is very urgent as we are not
receiving any of our normal business mail!!!

Thanks
Mike
.

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