use the following Power Shell Command to recreate routing group connector between Exchange server 2003 to 2007 :
New-RoutingGroupConnector -Name "Interop RGC" -SourceTransportServers "Ex2007Hub1.contoso.com" -TargetTransportServers "Ex2003BH1.contoso.com" -Cost 100 -Bidirectional $true -PublicFolderReferralsEnabled $true
It would resolve all your mail delivery issues between Exchange server 2003 to 2007
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