Extract last email from an email file (mbox format)

Xu Wang <[email protected]> Wed, 25 May 2016 02:12:30 -0400
Newsgroups gmane.mail.procmail
Message-ID <CAJhTkNhhnO-TXOY-rxCQY-e7220hfwvvVNMJHzrJ9s8FS1HCiw@mail.gmail.com>
Hi how can I efficiently extract the last email in a huge mbox email file?

Kind regards,

Xu