Basic
Email Know How - Header Tag Define
This
section deals with general topics about e-mail. It is a good resource
to learn more about e-mail concepts and practices.
Sections
in this category:
This sample
message shows how the headers appear in the email.
Received:
- This header usually includes which computer the message was sent
from, the SMTP (outgoing mail) server(s) used to deliver the message,
the destination address, and what date and time (according to the
SMTP server) the message was put into the mail server's outgoing
queue. This is a key header in determining the correct origin of
an email message.
In our
example, the
Received: header explains that this message was sent from mycomputer.sanbornwebdesigns.com
on Monday, August 17th at 9:20 through the YourDomainName SMTP (outgoing
mail) server, destined for David@HisWebSite.com.
Message-Id:
- A unique identifier assigned to each message by the SMTP (outgoing
mail) server. The suffix of this header lists the name of the mail
server that assigned the unique identifier.
X-Sender:
- This header usually indicates the POP account setting in the email
application from which the message was sent. This may or may not
be the same at the From: header. This header is sometimes invalid
(faked) in unsolicited email.
X-Mailer:
- Indicates which email application the message was sent from. In
our example,
we used Eudora Pro Version 3.0.3 for Windows
95.
Date:
- The date and time which the message was sent, according to the
computer from which it was sent (mycomputer@TheirWebName.com).
To: - The
destination address.
From: - This
header indicates the return address setting in the email application
from which the message was sent. This header is sometimes invalid
(faked) in unsolicited email.
Subject: -
Indicates the subject of the message.
Mime-Version:
- Indicates which version of MIME was used by the email application
from which the message was sent.
Content-Type:
- Indicates to the email application which type of data is contained
within the email message.
X-UIDL: -
A unique identifier assigned to the message by the POP (incoming
mail) server when it is downloaded onto your computer.
Other headers
are possible, but the ones described above are the most common ones
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