title: Why do RECEIVED email headers seem to be out of order chronologically?
body: <p>When reviewing the headers, it appears that the 2nd server to receive the message didn't relay it until AFTER the reported delivery date in the final header.</p>
  
  <p>At c9mailgw11.amadis.com, the reported time was 22:47:49 -0800 (PST). However, the final server, BY2PR0401MB0966.namprd04.prod.outlook.com, reports the time as 06:46:08 +0000.</p>
  
  <p>Is the discrepancy due to something simple, like a bad clock on the amadis relay?</p>
  
  <p>I've written a script that detects email delays, and when I hit an oddity like that I get a negative value from that hop to the next and I want to understand why they are ordered this way to see if I have way to lookahead. </p>
  
  <p>Can anyone offer insight? </p>
  
  <pre><code>**Received: from BY2PR0401MB0966.namprd04.prod.outlook.com (10.160.64.15) by
   CY1PR0401MB0971.namprd04.prod.outlook.com (10.160.160.17) with Microsoft SMTP
   Server (TLS) id 15.1.403.16 via Mailbox Transport; Wed, 17 Feb 2016 06:46:08**
   +0000
  Received: from BN3PR0401CA0023.namprd04.prod.outlook.com (10.162.159.161) by
   BY2PR0401MB0966.namprd04.prod.outlook.com (10.160.64.15) with Microsoft SMTP
   Server (TLS) id 15.1.409.15; Wed, 17 Feb 2016 06:46:07 +0000
  Received: from BN3NAM01FT022.eop-nam01.prod.protection.outlook.com
   (2a01:111:f400:7e41::207) by BN3PR0401CA0023.outlook.office365.com
   (2a01:111:e400:51d1::33) with Microsoft SMTP Server (TLS) id 15.1.409.15 via
   Frontend Transport; Wed, 17 Feb 2016 06:46:07 +0000
  Received: from BAY004-MC1F22.hotmail.com (10.152.66.51) by
   BN3NAM01FT022.mail.protection.outlook.com (10.152.67.153) with Microsoft SMTP
   Server (TLS) id 15.1.409.7 via Frontend Transport; Wed, 17 Feb 2016 06:46:06
   +0000
  Received: from mail2world.com ([209.67.128.125]) by BAY004-MC1F22.hotmail.com with Microsoft SMTPSVC(7.5.7601.23143);
       Tue, 16 Feb 2016 22:46:06 -0800
  Received: from mail pickup service by mail2world.com with Microsoft SMTPSVC;
       Tue, 16 Feb 2016 22:46:04 -0800
  ResentFrom: xxx@xxx.com
  Return-Path: xxx@xxx.com
  Received: from 216.163.188.203 unverified ([216.163.188.203]) by mwpop05oc.mail2world.com with Mail2World SMTP Server; 
      Tue, 16 Feb 2016 22:46:01 -0800
  **Received: from sender153-mail.zoho.com (unknown [74.201.84.153])
      by c9mailgw11.amadis.com (Postfix) with ESMTP id A432C5B996A81
      for &lt;xxx@xxx.com&gt;; Tue, 16 Feb 2016 22:47:49 -0800 (PST)**
  DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; 
    s=zapps768; d=zoho.com; 
    h=content-type:mime-version:subject:to:from:date; 
    b=b6BP/HJmeP+ORBz043y8K0tUFE3u3c8tUZvDSHjfuH0zD84gax1wUlRdYGps/SBd7SnFHYT1Plps
      wRQOJoRp6hEMPerW6MSOL9psGWfNel4lnZwdtr7ujnuh54CTTEwV  
  Received: from [192.168.10.1] (xxx.xxx.net [xx.xx.xx.xx]) by mx.zohomail.com
      with SMTPS id 1455691501828999.0688176107503; Tue, 16 Feb 2016 22:45:01 -0800 (PST)
  </code></pre>