Apple Mail 2.x (Mac)
- Select the message you want to view the headers of.
- Press SHIFT-COMMAND-H to toggle full headers for the message.
(Alternatively you can click VIEW in the menu bar, click MESSAGE, click
LONG HEADERS.
Microsoft Outlook 2003 (Win)
- Select the message you want to view the headers of.
- Right click the mouse, select OPTIONS
- Headers will be displayed within the "Internet Headers" area of a pop-up window.
Mozilla Thunderbird 2.x (Win)
- Select the message you want to view the headers of.
- Press CTRL-U (or click VIEW from the menu bar, select MESSAGE SOURCE)
- Headers will be displayed in a new window.
Google Mail (GMail)
- Open the message you want to view the headers of.
- Click the down arrow next to the "Reply" link.
- Select "Show Original" to open a new window with the full headers
Windows Live Hotmail
(Full Version)- This does not work with Safari on Mac OS X
- Right click on the message. (From the list of emails)
- Select "View Source"
- A new window with the full headers and HTML source of the email will open
Yahoo Mail
"New" Version- Right click on the message.
- Select "View Full Headers"
- A new window with the full headers will open
Yahoo Mail
"Classic" Version- Click on the message.
- Click "Full Headers" on the bottom right of the screen