Exchange 2010 Open Relay problem
Posted on 2010-01-04
I have set up a Receive Connector in Exchange 2010 for our connection to Postini, it is supposedly locked down to the range of IP addresses assigned to us from Postini. The problem I have is that I can connect to it via telnet and successfully send a message from an external PC connected to an ADSL connection so it is effectively an open relay.
According to what I have read this is practically impossible, so my question is does anyone have any idea why Exchange is ignoring the IP Address range restriction that is in place on this connector?