First, because this module is going to modify the Sender: field for

outgoing mail, we stash the original value of msg.GetSender() in a
message object attribute msg.original_sender.  This is used by the
Acknowledge module.

Second, only perform subject prefix prepending if not msg.isdigest an
dnot msg.fastrack.  I.e. the message isn't a pre-crafted digest
message, and it's not being fast tracked via HandlerAPI.DeliverToUser.
Fast tracking means it's being delivered to a single address and not
to the general list subscribership.

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