Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

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

Posted on 2014-02-19
4
2,968 Views
1 Endorsement
Last Modified: 2014-02-19
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
1
Comment
Question by:stevebishop
  • 2
  • 2
4 Comments
 
LVL 37

Accepted Solution

by:
Jamie McKillop earned 500 total points
ID: 39870623
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
1
 

Author Comment

by:stevebishop
ID: 39870945
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
 
LVL 37

Expert Comment

by:Jamie McKillop
ID: 39870952
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
 

Author Comment

by:stevebishop
ID: 39871444
Thanks JJ,

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

Sbishop
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Utilizing an array to gracefully append to a list of EmailAddresses
Read this checklist to learn more about the 15 things you should never include in an email signature.
In this video we show how to create a mailbox database in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Servers >> Data…
The basic steps you have just learned will be implemented in this video. The basic steps are shown to configure an Exchange DAG in a live working Exchange Server Environment and manage the same (Exchange Server 2010 Software is used in a Windows Ser…

792 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question