Exchange 2007 SPAM troubles

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I have a domain that sends us legitimate email, but also sends a truck
load of SPAM. I want to keep the sender reputation agent turned on,
but it always adds this domains mailserver to the IP Block list.

If the mailserver is added to the IP Allow list, all their spam
bypasses the content filters and ends up in my Inbox. Is there a way I
can tell the sender reputation agent to ignore this one domain? Or a
middle ground between IP Allow and IP Deny that doesn't bypass the
content filtering agent?

Thanks in advance!

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