Relay Messages in Exchange 2007

Hello All,

I have an Exchange 2007 server in my network and an Exchange Edge 2007 inside my network.
The Exhcange 2007 server is on
The Edge server is on and also have a second IP of
I've just upgraded from Exchange 2000 to Exchnage 2007. My CIO required me to put the Edge server inside our network to protect our email from other consotiums inside our network. Not great I know but...

The problem is that the old exchange 2000 server was on It is now on and I'm trying to get the Edge server to accept email from another server and relay to inside our network and to external clients. It keeps failing.

Our internal domain is cat.lmc
The server or application the email is coming from is on Lmc.
The application sending the email notifications is from and the server ip is on

I have a receive connector on the Edge server with the receive settings on receive on on port 25 and receive mail from servers with the range added.
It is working for only local addresses within my network, but I need it to send emails to external addreses too.

I hope I have given suffcient info.
Please help.
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Do you receive any error messages when you attempt to send emails?

Check also that the Exchange server is configured to receive emails for the recipient domain - in the Exchange Management Console, under Organisation -> Hub Transport -> Accepted Domains (I believe that is the correct location, don't have console access at the moment), check your domain is listed and is configured as the correct type.

More info here -
Additionally, have you configured the relaying options to allow the Edge Transport server to relay from It may be configured to require authentication to connect to send, in which case you may need to add that IP address to the list of allowed hosts to relay through the Edge Transport.

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AmpletrixAuthor Commented:
The error I get is:

Send Command failed: 550 5.7.1 Unable to relay

I added hotmail to the trusted domain as an external trusted relay domain, and it worked fine. Thanks for the help.
I have added all the domains I need, and it's going great.
Thanks again.
AmpletrixAuthor Commented:
All the info I needed was in the provided article.
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