I should have mentioned that my method of choice and my reasoning are
more applicable when the Message Pane is turned off, which is my normal
layout preference. [View > Layout > Message Pane, or F8 key]
On 9/30/2010 10:02 AM, Don Tripp wrote:
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You can also see the headers -- without opening the email -- by viewing
the Message Source. This is done by highlighting the email in question
then selecting the Message Source option from the View menu (or by
using the Control-U shortcut). You will see the entire email source in
a new window, including all the headers.
I find this approach more convenient because you can see the full
headers plus the details of any links in the body of the email (to
inspect for origin). Other advantages are that it is safer (harder to
click on links accidentally), doesn't trigger web bugs, wraps the
headers for easier viewing (the View All Headers option lets them run
off the screen to the right, making it harder to see them), and is
easier to invoke because of the Control-U shortcut. YMMV.