How to See Full Email Headers in Outlook.com and Hotmail

In Outlook Mail on the web, you can get access to the full email header information.

Why Examine Email Header Lines?

When you want to trace spam to its source and report the network abuse to the internet service provider, or when you need to to see mailing list commands hidden in header lines, it is important to see the mail's full headers.

By default, Outlook.com shows only a few important headers, but you can make it display all header lines.

See Full Email Headers in Outlook Mail on the Web

To get access to full message headers in Outlook Mail on web (at Outlook.com):

  1. Locate the email whose headers you want to examine in the message list.
  2. Click on the message with the right mouse button.
  3. Select View message source from the context menu that has appeared.
    • The header lines are all from the very top of the Message source display to the first empty line.
  4. When you are done, click Close.

See Full Email Headers in Outlook.com

To open all email headers for a message in Outlook.com:

  1. Open the message whose headers you want to examine in Outlook.com
  2. Click Actions.
  3. Select View message source from the menu that has appeared.

As an alternative, you can also click with the right mouse button on the email in the message list and select View message source from the context menu.

See Full Email Headers in Windows Live Hotmail

To see the full email including all header lines in Windows Live Hotmail:

  1. Open the desired email in Windows Live Hotmail.
  2. Click the down arrow next to Reply in the message's header area near the sender and subject.
  3. Pick View message source from the menu.

What Do Email header Lines Look Like?

An email's header lines can look like the following example. Note the empty line that ends them; "------=_Part_58707437_2076899448.1465826767619" is the first line of the message body.

x-store-info:J++/JTCzmObr++wNraA4PVO18DMe20MI/h2ZSCKs2IFBjIh1lkk9RjXZg9oMrgoMgITNNu9P8TtlGKrrqE9MNMnl/0ZUlDv6tDZRKOjJR+36TsIjQjPEisnwFzsku0Nz2/4+PIVGoqUwC95iMbmJwA==
Authentication-Results: hotmail.com; spf=pass (sender IP is 192.64.237.138; identity alignment result is pass and alignment mode is relaxed) smtp.mailfrom=delivery@bounce.about.com; dkim=pass (identity alignment result is pass and alignment mode is relaxed) header.d=nws.about.com; x-hmca=pass header.id=newsletters@nws.about.com
X-SID-PRA: newsletters@nws.about.com
X-AUTH-Result: PASS
X-SID-Result: PASS
X-Message-Status: n:n
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTE7YT0xO0Q9MTtHRD0xO1NDTD0w
X-Message-Info: NhFq/7gR1vTd35DyQzeG5pQU8qjhHQ68PAXgU4HrQUY99i4C6GftcnKZ3DdaWrgomO3vqxBD02cswpP/a7n6mP4hPiKutJnKGsI9zYzHq/xCVDZAzFWs3i4oPs9KHhTzp65Q1jDF10jWCL5U6Q7up7vUr5h/SFAvNKbOkjn706Fed3JiUJre4DCBG8hCjqz+IUEbEQMWaVzlXNNN2Vy/QzTrOHEB7qRQboEMXvMdZrHnrlKbhzGgCQ==
Received: from mx-about-e.sailthru.com ([192.64.237.138]) by COL004-MC1F36.hotmail.com with Microsoft SMTPSVC(7.5.7601.23143);
     Mon, 13 Jun 2016 07:07:34 -0700
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; s=mt; d=pmta.sailthru.com;
 h=Date:From:To:Message-ID:Subject:MIME-Version:Content-Type:List-Unsubscribe;
 bh=/x9mSI1/3belVDEO7+iT5KbOGbQ=;
 b=De0aoNb/21g5D02u6zSs7K8u5rTj16FFYwR68iv8VAZ8+iieu9t6g2bi7MqitzxbC9+n8ElbwFXe
   cl8T3iHsqdAAvKTzXfsOWcE27quD6vzc/x9LaTni8w6tF5zsLg5+6L+2B0RxcQazZPfmlPoNeevS
   p5/qPfXI1vAkkiV4BtI=
Received: from mtast-04.sailthru.com (204.153.121.10) by mx-about-e.sailthru.com id hbqv2c1qqbs7 for ; Mon, 13 Jun 2016 10:06:23 -0400 (envelope-from )
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; t=1465826767;
    s=sailthru; d=nws.about.com;
    h=Date:From:To:Message-ID:Subject:MIME-Version:Content-Type:List-Unsubscribe;
    bh=ACXv4jdokwumK/L9OVA3T2v4IfvcGHt/xOeHbH0WmNw=;
    b=SUNNIUZeGmQiFWBToPNgP8VMh9oazcau0tXjOOWqD5ks3fXT9n3ig+xSycs6e9bG
    6X6X/cN9mF9DCnqsky7i6H2g+5wGJWsjAzSzCM1bqd+FSBfEI9PVA8QK43jNZqUHPek
    XmaJ6QflWwNHDVIdMHFE0/PH53ddEGjNs1Alzg0E=
Date: Mon, 13 Jun 2016 10:06:07 -0400 (EDT)
From: "About.com Email"
To: example@hotmail.com
Message-ID: <20160613100607.6927111.278438@sailthru.com>
Subject: About.com's 14 Favorite Sites for Sending Summer E-Cards
MIME-Version: 1.0
Content-Type: multipart/alternative; 
    boundary="----=_Part_58707437_2076899448.1465826767619"
Precedence: bulk
X-TM-ID: 20160613100607.6927111.278438
X-Unsubscribe-Web: http://link.about.com/oc/5438b88e8387214c188b566b44gzr.5yue/854ab1dc
List-Unsubscribe: ,
X-rpcampaign: sthbt6927111
Return-Path: delivery@bounce.about.com
X-OriginalArrivalTime: 13 Jun 2016 14:07:34.0723 (UTC) FILETIME=[EF062930:01D1C57C]

---—=_Part_58707437_2076899448.1465826767619
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable

(Updated June 2016, tested with Windows Live Hotmail, Outlook.com and Outlook Mail on the web in a desktop browser)

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