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ex2010 - Configure relay permission for a user

Starquest321 used Ask the Experts™
I have a user which I would like to give relay permission for on an Exchange 2010 box.  There is a software that sends email under his name. Right now the 2010 box give a 550 5.7.1  Unable to Relay error.
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Have you tried adding the users IP to allowed senders group?

1. Exchange Management Console --> Server Configuration

2. Right-click Hub Transport, select properties

3. Select Network tab, then add user's IP under "Receive mail from remote servers that have these IP addresses"

Let us know if that works, or if you need additional help.