Just to follow-up to a certain extent...
Instead of full headers, I'd settle for a full recipient list, so I can see who all was CC'd.
I've also found that when you reply or forward, the full headers are quoted, and I'll acknowledge that "reply or forward the message and look at the quoted text" is a valid answer to my question - but at that's an awful long way to go to get information that should be readily available.
I've read of "hold on a message to pull up the context-sensitive menu and then select 'Details'", but on my EVO, "Details" isn't an option on that menu.
I'm also familiar w/ K-9 mail, but I'm having trouble getting it to work with EAS - and I don't like the way it looks.
What I'm really after is functionality that should be present in the native application.
Can anybody help?