Extended Mailgate error

Dear users,

We use RT to accept certain automated emails. These emails get put into
queues as tickets, and are acted upon by appropriate personnel.
One automated email (we can’t change the content of these emails) has
"Priority: normal" in the body of the email.
Since the Extended Mailgate extension for RT expects “Priority:” to be a
number, it throws an error.

We don’t really use the “Priority:” command for the extended mailgate.
Is there any way to disable it?

Also: we would use the configuration directive “commandbymailgroup”, but the
automated system sets the From: line in the email to the email address of
someone who commands by mail.

Any help would be greatly appreciated!

RT 4.0.1, Extended Mailgate version 0.10