Fuente: https://pobox.com

• Gmail: Click on the down arrow, next to the Reply button, at the top right corner of the message. Select “Show original”.

• Hotmail: Click on the down arrow, next to the Reply button, at the top right corner of the message. Select “View Message Source”.

• Yahoo!: At the bottom right corner of the message, click the link for “Full Headers”.

• Outlook 2010: Open the email in a separate window. Click the “File” tab. Select the Properties button. They are in the Internet Headers box.

• Outlook 2007: Click on the small arrow to the right of Options. They are in the Internet headers box.

• Outlook 2003: Right clicking on the message from your mailbox and select Options. They are in the Internet Headers box.

• Thunderbird: Click View > Message Source.

• Mac Mail.app: Click View→Message→Full Headers, or Shift-Command-H.

• Microsoft Exchange: Click on File→Properties→Internet.

• Eudora Pro: Go to the tool bar just above the message, and click the button that reads “blah blah blah”.

• AOL Mail: Right click on the message, then select “View Message Source”.

• Mutt: Hit “h”.

• Pegasus E-mail: press Ctrl-H.