OK, what are internet headers?
In addition to the usual To:, From:, and Subject: fields you see in your email, every message also carries detailed information about its route along the internet from sender to recipient. And every mail server it passes through puts a time stamp on it, indicating when it handled the message. Most email programs hide this information from plain view because it’s not necessary or important for everyday email use. But it’s always there in every message. And while it may look like undecipherable gibberish, it can tell an email administrator where the message came from and allow them to block that sender. Each email program stores them slightly differently; refer to our header information page for help on retrieving the headers.
