As Admin you can delete specific wrongly send emails from your users mailbox : Open Exchange Powershell , To delete from user@example.com email with the subject “Mail delivery failed: returning
Day: December 11, 2016
How to change exchange Preferred Server For DBHow to change exchange Preferred Server For DB
Open exchange Powershell Set-MailboxDatabaseCopy -identity {Database_Name\New_Server_Name} -ActivationPreference 1 Confirm: Get-MailboxDatabase 'Database_Name'|fl server, databaseCopies, activationPreference