Exchnage 2010 Cant relay to External Mail Recipients

We have Exchange 2010 SP1, and setup a receive connector as below

Network -  Local Ip all
Remote Server - 192.168.254.100
Authentication  - None
Permissions Group - Anonymous

however, internal clients on our domain can recieve emails from the source applcaition server through our mail server and into thier mailbox,  but emails are not being sent to external email accounts.

In message tracking we dont even see exchange ackowledge emails that were specified for external users, but it does show internal.

Any Help woould be appreciated.   ( As one can guess, this is now affecting our client communications severely )

Alan.
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SingnetsvcAsked:
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tigermattCommented:

By default, "anonymous" permissions on a receive connector don't include the necessary rights to relay through the box to any sender. You need to give this right through the shell, which is in some senses deliberate to remove the risk of opening yourself up as an open relay accidentally.

In the Exchange Management Shell run the following command:
 Get-ReceiveConnector "NAME HERE" | Add-ADPermission -ExtendedRight MS-Exch-SMTP-Accept-Any-Recipient -User "NT AUTHORITY\ANONYMOUS LOGON" 

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That will enable relay on the connector - so do be sure your security settings (such as the IP address to receive mail from) are accurate.

Also, lots of permissions are cached by Exchange so the change may not be immediate.

-Matt
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