A couple of examples...
- We use a mailbox called "Shared" where multiple people can copy their e-mail messages to share them internally. We do not wish this address to be sent from (uncheck the "Allow Send" box); nor do we want it to be sent to (uncheck the "Allow Relay" box).
- We have a mailbox called "Fax" that receives our company faxes. We do not want Users to send messages out from this mailbox, which will also stop replies being sent back to it to (uncheck the "Allow Send" box).
Open the System Administration screen from the Go To menu. Open the Mailboxes listing, and Edit a mailbox. On the Add/Edit Mailbox dialog is the new checkbox Allow Send, uncheck the box to disallow sending from this address/mailbox.
When a mailbox does not have the ability to send from it, and a message in that mailbox is Forwarded or Replied to, the message will default to come from the User's Default Mailbox, as set in their Preferences.