make bounces more user-friendly
currently, when I reply to a redmine task notification by mail from an unregistered email (forget to change my "from" account), I get an ugly bounce:
The mail system <email@example.com>: permission denied. Command output: Request was denied by your Redmine server. Possible reasons: email is sent from an invalid email address or is missing some information.
it would be very nice if instead of bouncing that mail, Redmine would send a normal notification of not having enough privileges
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