osTicket/osTicket-1.8 — pull request #528 by greezybacon (2014-02-04 17:28:12+00:00)
Title: pipe: Use Delivered-To and Message-Id from outer

If a wrapped mail is sent, copy the Delivered-To header into the nested
message so it will be clear(er) how the mail arrived into the system. Also,
copy the Message-Id into the nested mail if there is none to help against
mails delivered repeatedly.