troubleshooting Question

MS Exchange 2003 smtp virtual server deny emails of local domain send from outside...

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agortsFlag for Greece asked on
Email ProtocolsExchange
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I have an email server MS Exchange 2003 with a default smtp virtual server...

Now it possible to telnet xxx 25 in this server, from outside the local network (from the internet) and send an email with "mail from" as xxx@YYY.com (where YYY.com is the domain name which this email server serves...)

Why is this happening?

How can I block any outsider from sending an email as it belongs to our domain?

I have checked my servers for open relay... with negative results...

Is this problem some kind of open-relay issue?

Thank you for your help...
ASKER CERTIFIED SOLUTION
MegaNuk3

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