How to display full header of incoming emails?

FU

Select the message>view message source.  It will look something like this

x-store-info:J++/JTCzmObr++wNraA4PVO18DMe20MI/h2ZSCKs2IHAwA/umbXgbhZz7kI8IRisIKCc/aF0dCydz2SYTctAOcEKhD4Wc6fQbNVOi762qPhO8I1SNhz/sugyO9ezyCIf3sRCfGrUBgWZH9qLDPqqJQ==
Authentication-Results: hotmail.com; spf=pass (sender IP is 204.152.18.139; identity alignment result is pass and alignment mode is relaxed) smtp.mailfrom=*** Email address is removed for privacy ***; dkim=pass (identity alignment result is pass and alignment mode is relaxed) header.d=yammer.com; x-hmca=pass header.id=*** Email address is removed for privacy ***
X-SID-PRA: *** Email address is removed for privacy ***
X-AUTH-Result: PASS
X-SID-Result: PASS
X-Message-Status: n:n
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTE7YT0wO0Q9MTtHRD0xO1NDTD0w
X-Message-Info: NhFq/7gR1vTmLp4CVCZb37xe5VN2VmmfSOUyHfGbJcSzZBhWqH6WgTJHxh8+FaSftVJPrmN3ecjg9omjo/VVf8cJWaiEh6iRHbrQhxJqRAzjsJ8I8RETEhbdzSW9qiJM3H6ShQqjnwMKhSkLKqs85jAug1Sd745A4+EeoKG+kp2NAdOskj5gS6zNoOS1zYMv4lEyonFv5LGeqopWw0nl/zQlLyCjK/12
Received: from mx7-out.yammer.com ([204.152.18.139]) by COL004-MC3F21.hotmail.com over TLS secured channel with Microsoft SMTPSVC(7.5.7601.22751);
	 Thu, 19 Mar 2015 08:37:53 -0700
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=sm; d=yammer.com;
 h=Date:From:Reply-To:To:Message-ID:Subject:Mime-Version:Content-Type:Content-Transfer-Encoding;
 bh=frhteMpenjlO1WalOIkbdmCjwuM=;
 b=jA1fH4wFBUm0yQnAnEpYRT4lVn5LzKUbY4uhiZ7zk6NKs+sWuj0mlwVzcRWG3qlXbeWwVy++8x4A
   hfX6kS10U7mpP0fHiUnCqI6hf5hkAAA/9AbPzXZWx7fh8YnxThydrUUr/xjuOJs5POelNkDfu4vx
   fzl6O0FdRqlIVlYkOMc=
DomainKey-Signature: a=rsa-sha1; c=nofws; q=dns; s=sm; d=yammer.com;
 b=Wf4K7HK8zAIY2FlX3v2a1s8sVNLzfmKS6tAEPBSSv/gxTfRDRHqCmcoNz18L/Dxt0LJBc7lYPFwE
   nOfyGKLknXHKy0S2G5nYLMvdKJ2AiL/Dw1nTNYp+FkjoaILmyB2pH8uBza8t6yloH3YrL+9h5ftS
   9qjYuxTmSu81PPQeRJ4=;
Received: from yammer.com (10.160.16.206) by mx7-out.yammer.com id h1bml214mt0k for <*** Email address is removed for privacy ***>; Thu, 19 Mar 2015 08:37:46 -0700 (envelope-from <*** Email address is removed for privacy ***>)
Date: Thu, 19 Mar 2015 15:37:45 +0000
From: Yammer <*** Email address is removed for privacy ***>
Reply-To: *** Email address is removed for privacy ***
To: 
Message-ID: <*** Email address is removed for privacy ***>
Subject: How to use Yammer by email
Mime-Version: 1.0
Content-Type: multipart/alternative;
 boundary="--==_mimepart_550aed49317f9_7c471156db81484a0";
 charset=UTF-8
Content-Transfer-Encoding: 7bit
X-Auto-Response-Suppress: All
Precedence: bulk
X-Sutakanat: yammer_production_posting_instructions
X-RPTags: yammer_production_posting_instructions
X-campaignid: yammer20150319153745
Return-Path: *** Email address is removed for privacy ***
X-OriginalArrivalTime: 19 Mar 2015 15:37:53.0802 (UTC) FILETIME=[AA54FEA0:01D0625A]

I don't have that option, that's exactly the point of my question :-(

Select the message>view message source. 

FU

I guess we should start by finding out what email system you are using

In order to help you effectively we need to know exactly what email system you are using.  You can see the differences here

In outlook.com, right click on a message in the message list, View message source

If you are viewing messages by conversation, open a message > click on the Actions menu

I guess we should start by finding out what email system you are using

I use sympatico.ca which is supposed to be the same as outlook.com as I have to login to the Microsoft Account to change passwords, etc. However, I now notice from the responses in this thread that the user interface is different. My user interface from my W8.1 desktop > Mail is extremely simple (even kludgy) and I looked everywhere in vain, I can't see email headers in my inbox and junk folder (the offending emails land in the junk folder)

I also use Outlook 2013 to access the account, and I do know how to look at email headers in Outlook 2013. But the thing is that those junk emails don't even come to my Outlook 2013 (This is also the reason why I just now discovered the issue, I normally don't look into the junk folder of W8.1 > Mail)

Any further advice?

P.S. Please don't address me with 'FU', I would appreciate it if you address me with my forum handle 'FormUser', thanks!