how to prevent telnet spoofing of internet email addresses with Exchange 2010

is there a way to prevent someone from telnet to my exchange server on port 25 and sending an email from user1-that-exist@mydomain.com to user2-that-exist@mydomain.com?

everything I've read so far doesn't really stop this. any suggestions?

Thanks
stevebishopAsked:
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Jamie McKillopIT ManagerCommented:
Hello,

You can follow the instructions in this article to prevent domain spoofing of your internal domains:

http://exchangepedia.com/2008/09/how-to-prevent-annoying-spam-from-your-own-domain.html

-JJ
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stevebishopAuthor Commented:
JJ,

Thanks for the response, what would be the opposite of that command in case I needed to revert the change?

Get-ReceiveConnector “My Internet ReceiveConnector” | Get-ADPermission -user “NT AUTHORITY\Anonymous Logon” | where {$_.ExtendedRights -like “ms-exch-smtp-accept-authoritative-domain-sender”} | Remove-ADPermission


Would it be

Get-ReceiveConnector “My Internet ReceiveConnector” | Get-ADPermission -user “NT AUTHORITY\Anonymous Logon” | where {$_.ExtendedRights -like “ms-exch-smtp-accept-authoritative-domain-sender”} | Add-ADPermission

?

Thanks
0
 
Jamie McKillopIT ManagerCommented:
You would run this command to revert back:

Get-ReceiveConnector “Name of your RCV connector” | Add-ADPermission -User “NT AUTHORITY\Anonymous Logon” -ExtendedRights “ms-Exch-SMTP-Accept-Authoritative-Domain-Sender”

-JJ
1
 
stevebishopAuthor Commented:
Thanks JJ,

Implemented the change, tested it and i'm not allow to do it anymore. Looks like its working!

Sbishop
0
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