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Get Notes mail to failover using MX record

My question is how can you get Notes mail to failover using an MX record in DNS after creating the same mail-in database on Domino server 1 & 2 without the message sitting in pending mode on server 2 when server 1 is unavailable? The MX record works but Domino server 2 holds it in its mailbox as pending waiting for Domino server 1 to become available again. Thanks in advance for any help you can provide me.
This is controlled in the R5 configuration documents. Under Router/SMTP then Advanced then Controls, you will find a field called Cluster failover. Set it to "Enabled for all transfers in this domain."

This was first published in January 2002