To view email headers of an email message, please refer to the appropriate version of your email client:
Outlook 2011
Open Outlook.
Ctrl+Click (or right-click with a two-button mouse) on the message from the message list.
Select View Source.
Full headers will appear in a new TextEdit document.
Outlook 2010
Open Outlook.
Open the email message in a new window.
Click on the File tab from the menu bar and choose Properties.
Full headers will appear in the box within the properties window.
Outlook 2007
Open Outlook.
Right-click on the message from the list of messages.
Select Message Options.
Full headers are displayed in the Internet Headers area.
Mac Mail
Open Mac Mail.
Click on the message you'd like to view headers for.
Go to the View menu.
Select Message, then Long Headers.
The full headers will appear in the window below your inbox.
Entourage
Open Entourage.
Click on the message you'd like to view headers for.
Click on the Message menu and select Internet Headers.
Mozilla Thunderbird
Open Thunderbird.
Click on the message you'd like to view headers for.
Click the View menu, and select Message Source.
The full headers will appear in a new window.
Gmail
Log in to Gmail.
Open the message you'd like to view headers for.
Click the down arrow next to Reply, at the top of the message pane.
Select Show Original.
The full headers will appear in a new window.
Hotmail
Log in to your Hotmail account.
Select Inbox from the left-side menu.
Right-click (or Ctrl-click) the message you'd like to view headers for, and select View Message Source.
The full headers will appear in a new window.
Yahoo! Mail
Log in to your Yahoo! Mail account.
Select the message you'd like to view headers for.
Click the Actions dropdown and select View Full Headers.
The full headers will appear in a new window.
