Assign send-as, receive-as and administer info store permissions

Assigning send-as, receive-as, and administer information store permissions to a user account, for eg besadmin

 

use this powershell script:

get-mailboxserver "servername" | add-adpermission -user besadmin -accessrights GenericRead, GenericWrite -extendedrights Send-As, Receive-As, ms-Exch-Store-Admin