What are email headers?

When you read an email, you generally see only a minimum of inforrmation -- the sender's name and email address, the subject, the message itself. But emails come with lengthy "header" data that documents the journey that email took to get to your email reader. Those email headers can be helpful for identifying false identities.

To see an email's headers in Gmail, click the vertical ellipsis (three dots) and then SHOW ORIGINAL. Outlook and other email clients have slightly different methods of viewing email headers, but you can generally find them pretty easily. The notable exception is mobile email readers, which generally don't provide this data; we therefore recommend using a laptop or desktop computer to investigate suspicious emails.