Received from mail header
The Received
header in an email message!
The Received
header is a standard header in email messages that records the path the message took as it was transmitted from the sender to the recipient. It's a way to track the message's journey through the email infrastructure.
Here's a breakdown of the typical format of a Received
header:
Received: from [sender's IP address] ([sender's domain name]) by [recipient's mail server] ([recipient's mail server's IP address]) with [transport protocol] id [unique message ID] for <[recipient's email address]>; [timestamp]
Let's break it down:
from [sender's IP address] ([sender's domain name])
: This part shows the IP address and domain name of the sender's mail server.by [recipient's mail server] ([recipient's mail server's IP address])
: This part shows the IP address and domain name of the recipient's mail server.[transport protocol]
: This part indicates the transport protocol used to deliver the message, such as SMTP (Simple Mail Transfer Protocol) or ESMTP (Extended SMTP).id [unique message ID]
: This part is a unique identifier assigned to the message by the mail server.for <[recipient's email address]>
: This part specifies the recipient's email address.[timestamp]
: This part shows the timestamp when the message was received by the recipient's mail server.
Here's an example of a Received
header:
Received: from mail.example.com ([192.0.2.1]) by mx.google.com with SMTP id i18-20020201T14:30:30Z for <[email protected]>; Thu, 01 Feb 2002 14:30:30 -0800
In this example, the message was sent from mail.example.com
(the sender's mail server) to mx.google.com
(the recipient's mail server) using the SMTP protocol. The message was received at 14:30:30 on February 1, 2002, and was intended for [email protected]
.