I'm just assuming the send connector is being ignored because when sending to myfakedomain.com messages get sent to a specific smart host. Then the rest of the messages get sent out the Internet Connector.
The Custom connector is set to use a smarthost. The Customer connector watches for a certain sender domain and if the domain matches the message is sent to a smarthost. That's the idea anyways.
have you checked message tracking to see what happens to the received message?
what makes you think it is 'ignoring' the send connector, as opposed to being bounced by the receieve connector?