Is it possible to prevent Exchange 2013 accepting spoofed (local domain) addresses?

Posted on 2014-10-22
Last Modified: 2015-01-09
We have a single Exchange 2013 server (let's call it SERVER) and a single e-mail domain ("").  Recently there has been a spate of spam messages being sent from both valid and invalid addresses, to valid addresses

First of all, is this something than can and should be blocked?  After all, spammers can still send from any other address that's not as long as the recipient address is valid, right?

If it should be blocked, what's the proper way to do it?  I have already tried the following but it doesn't seem to make any difference:
Get-ReceiveConnector "Default Frontend SERVER" | Remove-ADPermission -user "NT AUTHORITY\Anonymous Logon" -ExtendedRights "ms-exch-smtp-accept-authoritative-domain-sender"
Restart-Service MSExchangeTransport

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Thanks in advance!
Question by:David Haycox
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LVL 63

Accepted Solution

Simon Butler (Sembee) earned 500 total points
ID: 40398155
That command doesn't work on Exchange 2013.
No real solution at present that I am aware of, other than using a third party tool to deal with spam (very few use the native tools) or use the anti-spam agents that are built in and do sender ID look ups to block the messages.


Author Comment

by:David Haycox
ID: 40398765
Hi Simon,

Thanks - that's odd though, it's listed on Technet:

Yes, we're using F-Secure which does a pretty good job (for the messages in question, it marked them as spam and stripped the attachment).

In your opinion, is worth trying to block this sort of message anyway?
LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 40407376
I would be looking to see if the F-Secure product can completely block the messages, rather than just removing the attachment. Links will still get through for example.

I have queried with Microsoft to see if the command is still valid, but I don't know if I will get a response.


Author Comment

by:David Haycox
ID: 40412802
Yes, F-Secure has all those sort of options.  It's just a matter of getting the balance right, which of course can be quite different from one customer to the next.

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