Receive connector must have a unique combination of a local IP address, port bindings, and remote IP

The values that you specified for the Bindings and RemoteIPRanges parameters conflict with the settings on Receive connector

A Receive connector must have a unique combination of a local IP address, port bindings, and remote IP address ranges. Change at least one of these values.

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Are you getting the above error message from your Microsoft Exchange server?

To fix this problem you need to enable Anonymous on an Internet Receive Connector to receive internet mail

Some exchange admins prefer not to change the default connector and create a new internet connector that allows in email from the full ipv4 internet IP range 0.0.0.0-255.255.255.255.