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# Target mail sessions

After you create a mail session, you assign (target) it to one or more server instances or clusters. The mail session is registered only in the JNDI trees for the targeted WebLogic Server instances.

When you target all or part of a cluster, the Administration Console initiates a two-phase deployment. In general, such a deployment ensures that if the deployment fails for one active server, it fails for all active servers.

Note: To temporarily prevent applications from using this mail session, un-target it from all servers and clusters by deselecting them on the Targets tab.

To target mail sessions:

1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
2. In the Administration Console, expand Services and select Mail Sessions.
3. On the Mail Sessions page, click the mail session name.
4. Select the Targets tab.
5. To target servers that are not part of a cluster, under Servers, check the server name.
6. To target all or part of a cluster, under Clusters check one or more clusters. Then:
   - To assign a connection pool to the all of the servers in a cluster, select All servers in the cluster.
   - To assign a connection pool to selected servers in a cluster, select Part of the cluster. Check one or more servers in the cluster.
7. Click Save.
8. To activate these changes, in the Change Center of the Administration Console, click Activate Changes.
   Not all changes take effect immediately—some require a restart (see Use the Change Center).