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Any - Exchange 2007+ - Allow anonymous relaying

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Any - Exchange 2007+ - Allow anonymous relaying

Postby lmmtux » Fri Aug 24, 2012 3:03 pm

In Exchange 2007, 2010 and higher, anonymous relaying is disabled by default. This means if any other host on your network tries to use Exchange to send anonymous email outside of your organization, Exchange will block it.

While this is good in that it is more secure, there is no way to change this other than going in to the Exchange Management Shell (there is no place in the Exchange Management Console to change this).

To allow anonymous relaying:

It is best practice to create a new Receive Connector in Exchange to use for anonymous relaying. Doing this can help protect it from being used for sending unsolicited spam as it can be set to only allow connections from trusted or local hosts. You can use your default Receive Connector, but by doing so I would only recommend it if you have an email gateway that is between your Exchange Hub server and the Internet. Otherwise, your Exchange server can be used to send unsolicited spam.

Run this command in the Exchange Management Shell to adjust permissions for your Receive Connector:

Code: Select all
Get-ReceiveConnector “Receive Connector Name” | Add-ADPermission -User “NT AUTHORITY\ANONYMOUS LOGON” -ExtendedRights “ms-Exch-SMTP-Accept-Any-Recipient”

Where "Receive Connector Name" is the exact name of your Receive Connector.

If you have multiple Hub servers, you must run this on each one.
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