In olden days it was easy and straightforward to switch to "long headers", but I no longer can find any way to do that with any email client I use (eg, gmail).
Any helpful hints?
When viewing a message in gmail, click on the
disclosure triangle at the right end of the subject line, and choose
Show original from the dropdown menu. That'll give you the entire message's raw source, from which the full headers are easily copy-and-pasteable.
