Outlook Express, I loathe you – BUT, for some crazy reason people still insist on using you. Even though there are far better (and still free) email clients out there. I have had so many issues with Outlook Express, I implore you to switch to anything else – even Outlook. Just not the Express version.
How to View Email Headers in Outlook Express
1. Open Outlook Express
2. Right click on your email message and select Properties.
3. Click the Details tab
4. Click the Message Source Button