asked on

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

ASKER CERTIFIED SOLUTION

Jamie McKillop

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stevebishop

ASKER

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

Jamie McKillop

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

stevebishop

ASKER

Thanks JJ,

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

Sbishop