Incoming mail messages contain information about the routing of the message between its sender and you. By default, most mail programs don’t automatically display all of this information for you. You will see the basic header information (such as From, Subject, Date, and To) but the rest of the header information is normally hidden from view. However, sometimes you will need or want to display headers, especially if you are getting support from the IT Help Center about a specific issue.
Here is how to view header information:
Double-click to open the message you want headers for. Then go to File and click on Properties (on the Info tab). You will then see the Internet headers at the bottom of the window.Â If you need to email the full headers to the Help Center, you can select, copy, and paste the header text.
Right-click on the message and choose Options. You will see the Internet headers at the bottom of the window. If necessary, you can select, copy, and paste the header text to get it into a format that you can send.
OS X Mail
Go to the View menu and select Message and then Long Headers or even better, if the option is available, choose Raw Source. To copy this information into a new message, you may then choose Edit:Copy, open a new message, and choose Edit:Paste.
The message will not forward with full headers, but you can copy and paste the displayed headers into another mail message.