I did a "View source" on the most recent empty-looking message. Everything is
there. The whole thing is 742 lines long. You want the top how many lines? Or how would
I recognize the end of the header?
What displays in the header area (below the list of messages, above where the message body
displays) of Thunderbird is:
Subject users Digest, Vol 169, Issue 74
Against the right margin of the Subject line is "05:45 AM"