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You can configure a shared mailbox as an alias for UserA and UserB and then synchornize this email alias using the synchonization tool. After synchronization, when UserA signs in to the EUC via SSO. they can manage both their own quarantined emails and those in the shared mailbox. This is the same for UserB when it signs in to the EUC via SSO.

Step 1

Add the shared mailbox as an alias to the user. The procedure differs slightly depending on which Active Directory (AD) is in use. See the screenshots below for both Microsoft AD and Azure AD.

For Microsoft AD:

"postalAddress" should be used as the alias attribute.

Microsoft AD Screenshot

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Then modify the clientconf.xml in the Directory Synchronization Tool installation directory. Append the new attribute name into XML node <config> -> <default> -> <emailAliases> -> <emailAttr>.

clientconf.xml Modification Screenshot

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For Azure AD:

"Alternate email" should be used as the alias attribute.

Azure AD Screenshot

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Then modify the clientconf.xml in the Directory Synchronization Tool installation directory. Append the new attribute name into XML node <config> -> <AAD> -> <emailAttr>.

clientconf.xml Modification Screenshot

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Step 2

Synchronize the latest email alias to Trend Micro Email Security using the synchronization tool and make sure that the alias has been synchronized by exporting email aliases from the admin console to verify.

Synchronization Tool Screenshot

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Step 3

Set up single-sign-on of end user in the admin console and make sure the new attribute was not in the "Identity claim type" item.

Single-Sign-On Setup Screenshot

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Step 4

After the above configurations, we can verify that userA can manage the mails from both its own and shared mailbox.

Mailbox Management Verification Screenshot

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For concerns about the approve/blocked sender list of shared mailbox. UserA and userB can jointly manage the approved and blocked sender list of shared mailbox. That means, if userA adds an approved sender for the shared mailbox, userB can view and edit this approved sender.