SBS 2003 Recently Became a SPAM Launcher

5 pts.
Tags:
Exchange spam filters
Microsoft Exchange
SBS 2003
SBS 2003 SPAM Exchange
Small Business Server 2003
Even without email relay enabled or anyone gaining unauthorized access to the SBS 2003 server, our Exchange none the less became a SPAM source. Thousands of SPAM emails sent during a few hour period. I was wondering what others have found as a root cause for such a takeover and their experiences.

Software/Hardware used:
SBS 2003 Exchange

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