Displaying Full Message Headers in Email

In email messages, headers contain the addresses of all computer systems that have relayed a message between the sender and you.  Each computer that forwards the message along its route adds a line of information to the headers. Usually you do not see the full headers, as they can be fairly long and so are not displayed along with the common "From:", "To:", "Subject:", and "Date:" headers. The information provided in the full headers allows you to determine where a message actually came from, and how it got to your computer. This is sometimes necessary because the address you see on the "From:" line can be spoofed, or faked. 

If a Notre Dame email account appears to be involved with a questionable email message, you may be asked to provide the full headers to allow IT staff to track down exactly where the message came from.  Only the original recipient of the message can provide full headers; they aren't available in forwarded copies of the original message.  For instructions on displaying and sending full headers, follow the instructions below for the email client you use:

Gmail

Outlook 2011
Outlook 2010 & 2013
Outlook 2007
Mac Mail
Entourage
Mozilla Thunderbird

AOL
Hotmail
Yahoo! Mail

Gmail

  1. Log in to Gmail.
  2. Open the message you'd like to view headers for.
  3. Click the down arrow next to Reply, at the top of the message pane.
  4. Select Show Original.
     

The full headers will appear in a new window.

Outlook 2011

  1. Open Outlook.
  2. Ctrl+Click (or right-click with a two-button mouse) on the message from the message list.
  3. Select View Source.
     

Full headers will appear in a new TextEdit document.

Outlook 2010 & 2013

  1. Open Outlook.
  2. Open the email message in a new window.
  3. 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

  1. Open Outlook.
  2. Right-click on the message from the list of messages.
  3. Select Message Options.
     

Full headers are displayed in the Internet Headers area.

Mac Mail

  1. Open Mac Mail.
  2. Click on the message you'd like to view headers for.
  3. Go to the View menu.
  4. Select Message, then Long Headers.
     

The full headers will appear in the window below your inbox.

Entourage

  1. Open Entourage.
  2. Click on the message you'd like to view headers for.
  3. Click on the Message menu and select Internet Headers.

Mozilla Thunderbird

  1. Open Thunderbird.
  2. Click on the message you'd like to view headers for.
  3. Click the View menu, and select Message Source.
     

The full headers will appear in a new window.

AOL

  1. Log in to your AOL account.
  2. Open the message you'd like to view headers for.
  3. In the Action menu, select View Message Source.
     

The full headers will appear in a new window.

Hotmail

  1. Log in to your Hotmail account.
  2. Select Inbox from the left-side menu.
  3. 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

  1. Log in to your Yahoo! Mail account.
  2. Select the message you'd like to view headers for.
  3. Click the Actions dropdown and select View Full Headers.
     

The full headers will appear in a new window. 

 

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