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Domain emails sent spam

We have our organization email address and exchange server locally. All of a sudden, fake usernames are being sent to different users in our organization.  I.e. Fakeuser@ourdomain.org

Where would the problem rest? At the exchange server or at the local email accounts?
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al4629740
Asked:
al4629740
2 Solutions
 
Paul MacDonaldDirector, Information SystemsCommented:
These are probably e-mails coming from outside your organization, being sent to random, made-up users.  There's very little you can do about them except maybe get some anti-spam software, or start using the anti-spam features of Exchange.
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Adam BrownSr Solutions ArchitectCommented:
That's called Spoofing. Someone attempts to send messages from a made up email address at your domain to a valid email address on your domain as a way to get past low quality spam filters. Most often, this is resolvable by routing mail through a Spam filtering service or appliance (or Edge Transport role for Exchange) that is configured to know which email addresses are valid and block all messages that come from outside your network but use your email domain as the from address on the message.
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