Mail routing fails over if the recipient's mail server is not available when the router attempts to deliver the mail. As long as the mail server is in a cluster, the router delivers the mail to another cluster server that contains a replica of the recipient's mail database. Thus, the recipient continues to receive mail.

About this task

By default, mail routing fails over for the last hop of the delivery route only. That is, it fails over for the hop to the user's mail server, if the user's mail server is in a cluster. You can configure mail routing to fail over on any hop in the delivery route, or you can disable mail routing failover altogether.

When you configure mail routing to fail over on any hop, if any server along the route is unavailable but is in a cluster, mail routing fails over to a cluster server and that server continues routing the message. Enabling mail routing failover to occur on any hop is particularly helpful if you are using a hub server to route mail. If that hub server is unavailable but is in a cluster, the router delivers the mail to another hub server in the cluster. That hub server continues to send the message toward its destination.

Changing the mail routing failover setting

About this task

To change the default mail routing failover setting, make the following change in the Configuration Settings document for every server in the cluster and every server in the domain that can route mail.

Procedure

1. From the Domino® Administrator, click theConfiguration tab.

2. In the Task pane, expand Messaging.

3. Click Configurations.

4. Select the Configuration document for the server or server group you want, and clickEdit Configuration.

If you do not have a Configuration document for the server or server group you want, create one by clicking Add Configuration.

6. In the Cluster failover field, choose one of the following:

• Disabled
• Enabled for last hop only (the default)
• Enabled for all transfers in this domain

Results

This setting affects delivery to a client but does not affect sending a message from a client when the mail server is unavailable. If a user sends a message when the mail server is unavailable, the delivery fails over to another server in the cluster, and the router on that server sends the message.

Related concepts
Setting up a cluster

Related tasks
Creating mail database replicas in a cluster during user registration

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