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able to send mail to internal users w/o authentication

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supercoups

supercoups

MIS
Jan 17, 2002
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I was able to stop Spammers form using my exchange box as a relay by requiring Authentication to use SMTP. However it seems they are still able to send mail to my internal clients. How can i put a stop to this. For example if an external user configures his/her outlook express to use my smtp, they are able to send send SPAM to all of my internal users. If they try to send something out side of my domain it fails however. So I have been half successful. How to I stop them from sending mail to my internal clients?

Thanks,
Jim
 
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