Forces servers to abide by Domino 5 rules to resolve conflicts between Allow and Deny list entries in the SMTP inbound relay controls.
0 - Entries in the Allow field of the SMTP inbound relay controls take precedence over entries in the Deny fields when there is a conflict between them.
1 - Entries in the Deny fields of the SMTP inbound relay controls take precedence over entries in the Allow fields in the event of a conflict. Using the preceding example, if you deny relays to xyz.com, the host relay.abc.com cannot relay to the denied domain.

Note:

This variable was incorrectly documented in the Lotus documentation... it WAS previously referred to as SMTPRelayAllowHostsandDomains