Exchange 2003 Sending Mail of Behalf of domain

Every once in a while I get an email from someone that shows they are on my domain. But they are not the email address does not exist on my domain? How are they doing this? How do I prevent this from happening????
karmstrongAsked:
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OneHumpConnect With a Mentor Commented:
It's called "spoofing".  There really is little you can do about it.  Some perimeter apps allow you to reject envelope headers from an internal domain, but it's always possible to spoof the display field or the from header.  Signing email with an X.509 certificate will certainly validate the identity of legitimate senders, but spoofing has become a part of sending email over the Internet.

There are several "caller-ID" initiatives being proposed that will prohibit email from being sent from a domain by a server not registered to have permission to do so.

I hope that helps.

OneHump
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OneHumpCommented:
Where are we at with this?

OneHump
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