In Easy365Manager, you configure the “Enable Outlook auto-mapping for new delegate(s)” checkbox to automatically map another mailbox to the Outlook profile of a user when you grant them full access to that mailbox.
Note that if a user already has full access to a mailbox, the user must be removed from Full access and added again with the “Enable Outlook auto-mapping for new delegate(s)” configuration enabled.
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You can quickly locate the setting by opening up properties for a user, selecting the Mailbox tab, and clicking on Mailbox Delegation.
This opens up the following form, where you find “Enable Outlook auto-mapping for new delegate(s)” in the “Full access” section:

In Easy365Manager, the “Enable Outlook auto-mapping for new delegate(s)” setting corresponds to the ‘AutoMapping’ parameter of the Add-MailboxPermission PowerShell command.
The PowerShell command “Add-MailboxPermission -AutoMapping” is used in Microsoft Exchange Server to control the auto-mapping behavior for a mailbox in relation to another mailbox:
Add-MailboxPermission -Identity lene.hau -User alexander.adams -AccessRights FullAccess -AutoMapping $False
The default value for the ‘-AutoMapping’ parameter is true. This value enables automatic mailbox mapping, meaning that when a user is granted FullAccess permissions to another mailbox, that mailbox will be automatically added to the user’s Outlook profile.
When set to false, the ‘-AutoMapping’ parameter disables automatic mailbox mapping. In this case, if a user has been granted FullAccess permissions to another mailbox, that mailbox won’t be automatically added to the user’s Outlook profile. This may be preferable for a user with access to many mailboxes to avoid a negative impact on performance within Outlook.
In cases where auto-mapping necessitates modification for a mailbox with an existing Full Access grant, it involves rescinding the user’s Full Access consent through “Remove-MailboxPermission” and then re-bestowing Full Access while adjusting the AutoMapping parameter to False.