This article provides a summary on how to perform group operations for Mailboxes in MachPanel.
This article applies to MachPanel all versions.
Group Operation for Mailboxes:
Navigate to the following path: Home >> Service Director >> Exchange Hosting >> Exchange Accounts. 
Select Mailboxes tab and click Group Actions. See the snapshot below:

 
Following are available option for Group Actions on the selected mailboxes.
    - General Settings
 
    - Mailbox features
 
    - Mailbox database
 
    - Distribution List membership
 
    - Enable Litigation Hold
 
    - Add Email Alias
 
    - Update Primary Email
 
    - Personal archive settings
 
    - Public Folders
 
    - Email Forwarding
 
    - Calendar Permissions
 
    - Grant Permissions
 
    - Remove Permissions
 
    - Add Email Alias Using CSV
 
    - Enable/Update Journaling
 
    - Booking Delegates
 
    - Custom Attributes
 
    - Default Public Folder mailbox
 
If Exchange provider is 2013 (CU9) or later display checkbox under mailbox permissions Send On Behalf \ Send As "Message copy for Send On Behalf \ Send As enabled" [Checkbox] is shown.
In Mailbox features you can review the SPLA type.