bounce: Handle rfc-1892 style bounce notices
Sometimes an MTA may just send back the headers of the original message rather than the entire original message. Such an email will have a `text/rfc822-headers` part which will be the complete headers of the original message. Without this patch, osTicket will create a new ticket for the bounce message rather than attaching the new internal note to the existing ticket. References: https://tools.ietf.org/html/rfc1892
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