Avaya recommends that you enable the Messaging Address Validation feature on Avaya Workplace Client in the following situation:
When multi-tenancy is enabled for a hosted solution on Avaya Aura®, and the domains are shared between two tenants, but inter-tenant communication is not allowed.
After the Messaging Address Validation feature is enabled, Avaya Workplace Client pre-validates the addresses in its contact list, and Presence Services indicates if communication between the two tenants is allowed.