Create mail relay in Exchange 2007 & Exchange 2010

You may want to create an open mail relay in Exchange to allow other servers to relay mail through your exchange server.

There are 2 steps:-

1. Create a new receive connector in the management console. In the “permission groups” tab, check¬†anonymous permission and put the IP address of the server that you want to permit relay from. In the example below I have called the receive connector “Allowed Relays”

2. Open the exchange management shell and enter the command: Get-ReceiveConnector “Allowed Relays” | Add-ADPermission -User “NT AUTHORITY\ANONYMOUS LOGON” -ExtendedRights “Ms-Exch-SMTP-Accept-Any-Recipient”

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