Exchange 2007 - Crear conector para permitir Relay sin autentificacion

New-ReceiveConnector -Name wwwservidor -usage Custom -Bindings '10.xx.xx.46:26' -fqdn excservidor.xxx.org -RemoteIPRanges 10.xx.xx.135 -server excservidor -permissiongroups ExchangeServers -AuthMechanism 'TLS, ExternalAuthoritative'
Identity Bindings Enabled-------- -------- -------EXCSERVIDOR\wwwservidor {10.xx.xx.46:26} True


Tambien se puede agregar la ip a la lista de servidores internos de SMTP:
set-TransportConfig -InternalSMTPServers x.x.x.x

Para limpiar esta lista:
set-TransportConfig -InternalSMTPServers $null