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Outlook 2003, Exchange 2003

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We are recieveing mnumerous Sytem administrator and undeliverable mail emails in our inbox from messages that we did not send out in the first place. We will recieve about 3 per second at some times. We have verus protection on our server but this seems to be some sort of virus. How should i go about fixing????

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In reply to Outlook 2003, Exchange 2003

Clarifications

You don’t by chance have mail-relaying enabled do you?

In reply to Outlook 2003, Exchange 2003

http://support.microsoft.com/kb/895853

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