need option to see full headers

[zelkova]

I see only one other post anywhere that mentions this, but I consider
it very important. Users should have the option to view full message
headers. It could be a view/hide checkbox that shows header lines within the message text. Outlook does this in a separate popup when you ask for
the message "properties", but that's somewhat clunky.

[phoenix]

There is an option its called 'show original' and they can see the whole message. Right-click on the message.