Email Headers
Standard Headers
From, showing the sender's email address
To, showing the recipient's email address
Date, showing the date when the email was sent.
Optional Headers
Received, showing various information about the intermediary servers and the date when the message was processed
Reply-To, showing a reply address
Delivered-To displays the recipient’s name and address, as well as other addresses present in the CC and BCC
From: IP address/other details about sender
subject showing the message's subject
message-ID, showing a unique identification for the message
message body, containing the message, separated from the header by a line break
Return-Path: return address in case of email failure
Content-Type field indicates whether the format of an email was HTML, TXT, or any other option
Received-SPF: sender verification
Authentication-Results: ID of authentication performing server
DKIM Signature: details of the sender, message, and the public key which is required to perform message authentication
Custom X-Headers
X-Received: non-standard headers added by some email providers
Last updated