Dave Miller Blog

The Evolution of Email Headers

—

by

Dave
in

Early email messages contained a few simple header fields that recorded the sender, the recipient, and the path the message took through one or more intermediate email servers. Occasional spam was not yet a big deal. Here are all the email headers from a spam message I received in 2004:

Received: from 137-34-50.adsl.terra.cl (200.50.34.137) by aristo.pacific.net.sg with
          SMTP; 29 Jun 2004 17:44:02 -0000
Received: from reservoirdroids.com (in2.another.com [216.65.64.233])
          by 137-34-50.adsl.terra.cl (Postfix) with ESMTP id FF84EDEE6B for <@pacific.net.sg>;
          Tue, 29 Jun 2004 10:18:13 -0700 Message-ID: 100101c45dfd$d82c4613$bba7b27b@reservoirdroids.com>
From: “Ordeals S. Confers” <antisemite@reservoirdroids.com>
To: Subject: =?iso-8859-1?B?UmVwbHkuLg==?=
Date: Tue, 29 Jun 2004 10:18:13 -0700

A year later, email providers upped their game and tried to detect spam. The headers in this 2005 email message contains additional information that the servers inserted to show that the message had been analyzed and [incorrectly] determined to be legitimate, and the spam was delivered unscathed. The battle between spammers and email providers had begun.

Received: from psmtp.com (exprod5mx122.postini.com [64.18.0.36])
    by clean.spiretech.com (8.11.6/8.11.6) with SMTP id j1QELli14531
    for <tango@clean.spiretech.com>; Sat, 26 Feb 2005 06:21:47 -0800
Received: from source ([207.173.200.232]) by exprod5mx122.postini.com ([64.18.4.10]) with SMTP;
    Sat, 26 Feb 2005 09:21:46 EST
Received: (from tango@localhost)
    by atlas.spiretech.com (8.11.6/8.11.6) id j1QELk114524
    for tango@clean.spiretech.com; Sat, 26 Feb 2005 06:21:46 -0800
Received: from 88.bevivek.com (88.bevivek.com [66.63.188.88])
    by atlas.spiretech.com (8.11.6/8.11.6) with ESMTP id j1QELdL14446
    for <dave@inkdrop.net>; Sat, 26 Feb 2005 06:21:40 -0800
From: Four Seasons<Butler@bevivek.com>
To: dave@inkdrop.net
Subject: [spam] 6 Complimentary Bottles of Fine Wine - Our Gift to You
Date: 26 Feb 2005 09:20:55 -0500
Message-Id: <92234857@ejgzmklY-zwqa>
X-Envelope-To: dave@inkdrop.net
X-pstn-levels:     (S: 0.00000/ 8.90349 R:95.9108 P:95.9108 M:97.0232 C:60.3684 )
X-pstn-settings: 5 (2.0000:4.0000) S gt3 gt2 gt1 r p m C
X-pstn-addresses: from <Butler@bevivek.com> forward (good recip) [2546/120] 
Status:   
X-Text-Classification: spam
X-POPFile-Link: http://127.0.0.1:8080/jump_to_message?view=1959
MIME-Version: 1.0
Content-Type: multipart/mixed;
    boundary="--boundary-LibPST-iamunique-1069772051_-_-"

It’s been a cat-and-mouse game ever since with no end in sight. Here are the headers from a message I received today from a spam message that got through the gauntlet of spam detecting servers:

From - Thu Aug  1 09:08:15 2024
X-Account-Key: account16
X-UIDL: 1675109056.8937
X-Mozilla-Status: 0011
X-Mozilla-Status2: 00000000
X-Mozilla-Keys:                                                                                 
Return-Path: <AniketVermaq@outlook.com>
Received: from compute5.internal (compute5.nyi.internal [10.202.2.45])
     by slotwi21n26 (Cyrus 3.11.0-alpha0-669-gc35818610-fm-20240731.002-gc3581861) with LMTPA;
     Thu, 01 Aug 2024 00:08:47 -0400
X-Cyrus-Session-Id: slotwi21n26-1722485327-1117871-2-7764751912165447573
X-Sieve: CMU Sieve 3.0
X-Spam-known-sender: no
X-Spam-charsets: plain='iso-8859-1', html='iso-8859-1'
X-Resolved-to: dave@millermattson.com
X-Delivered-to: dave@millermattson.com
X-Mail-from: AniketVermaq@outlook.com
Received: from mx4 ([10.202.2.203])
  by compute5.internal (LMTPProxy); Thu, 01 Aug 2024 00:08:47 -0400
Received: from mx4.messagingengine.com (localhost [127.0.0.1])
    by mailmx.nyi.internal (Postfix) with ESMTP id 7B4806400A0
    for <dave@millermattson.com>; Thu,  1 Aug 2024 00:08:47 -0400 (EDT)
Received: from mailmx.nyi.internal (localhost [127.0.0.1])
    by mx4.messagingengine.com (Authentication Milter) with ESMTP
    id 4640F64C6A4.02ECF640095;
    Thu, 1 Aug 2024 00:08:47 -0400
ARC-Seal: i=2; a=rsa-sha256; cv=pass; d=messagingengine.com; s=fm3; t=
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    Su+X7A40aUjw2+kGqJ6uuw3F027Jf/LLlU8rBLsfyOw0Knte63R6BLTkXVesViUr
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    W+zwpsO93KojkFa/oFypKHlt5ER8hGj7PoUw==
ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=
    messagingengine.com; h=from:subject:date:message-id:references
    :in-reply-to:content-type:mime-version; s=fm3; t=1722485327; bh=
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    7ohOPw==
ARC-Authentication-Results: i=2; mx4.messagingengine.com;
    x-csa=none;
    x-me-sender=none;
    x-ptr=fail smtp.helo=EUR02-VI1-obe.outbound.protection.outlook.com
    policy.ptr=mail-vi1eur02olkn2094.outbound.protection.outlook.com;
    bimi=skipped (DMARC Policy is not at enforcement);
    arc=pass (as.1.microsoft.com=pass, ams.1.microsoft.com=pass)
    smtp.remote-ip=40.92.48.94;
    dkim=pass (2048-bit rsa key sha256) header.d=outlook.com
    header.i=@outlook.com header.b=LtMVS31S header.a=rsa-sha256
    header.s=selector1;
    dmarc=pass policy.published-domain-policy=none
    policy.published-subdomain-policy=quarantine
    policy.applied-disposition=none policy.evaluated-disposition=none
    (p=none,sp=quarantine,d=none,d.eval=none) policy.policy-from=p
    header.from=outlook.com;
    iprev=pass smtp.remote-ip=40.92.48.94
    (mail-vi1eur02olkn2094.outbound.protection.outlook.com);
    spf=pass smtp.mailfrom=AniketVermaq@outlook.com
    smtp.helo=EUR02-VI1-obe.outbound.protection.outlook.com
X-ME-Authentication-Results: mx4.messagingengine.com;
    x-aligned-from=pass (Address match);
    x-return-mx=pass header.domain=outlook.com policy.is_org=yes
      (MX Records found: outlook-com.olc.protection.outlook.com);
    x-return-mx=pass smtp.domain=outlook.com policy.is_org=yes
      (MX Records found: outlook-com.olc.protection.outlook.com);
    x-tls=pass smtp.version=TLSv1.2 smtp.cipher=ECDHE-RSA-AES256-GCM-SHA384
      smtp.bits=256/256;
    x-vs=clean score=30 state=0
Authentication-Results: mx4.messagingengine.com;
    x-csa=none;
    x-me-sender=none;
    x-ptr=fail smtp.helo=EUR02-VI1-obe.outbound.protection.outlook.com
      policy.ptr=mail-vi1eur02olkn2094.outbound.protection.outlook.com
Authentication-Results: mx4.messagingengine.com;
    bimi=skipped (DMARC Policy is not at enforcement)
Authentication-Results: mx4.messagingengine.com;
    arc=pass (as.1.microsoft.com=pass, ams.1.microsoft.com=pass)
      smtp.remote-ip=40.92.48.94
Authentication-Results: mx4.messagingengine.com;
    dkim=pass (2048-bit rsa key sha256) header.d=outlook.com
      header.i=@outlook.com header.b=LtMVS31S header.a=rsa-sha256
      header.s=selector1;
    dmarc=pass policy.published-domain-policy=none
      policy.published-subdomain-policy=quarantine
      policy.applied-disposition=none policy.evaluated-disposition=none
      (p=none,sp=quarantine,d=none,d.eval=none) policy.policy-from=p
      header.from=outlook.com;
    iprev=pass smtp.remote-ip=40.92.48.94
      (mail-vi1eur02olkn2094.outbound.protection.outlook.com);
    spf=pass smtp.mailfrom=AniketVermaq@outlook.com
      smtp.helo=EUR02-VI1-obe.outbound.protection.outlook.com
X-ME-VSCause: gggruggvucftvghtrhhoucdtuddrgeeftddrjeejgdekudcutefuodetggdotefrodftvf
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    lhhlvghrmhgrthhtshhonhdrtghomheq
X-ME-VSScore: 30
X-ME-VSCategory: clean
X-ME-CSA: none
X-ME-Received: <xmx:TwqrZkUevpagGcE8VpannB90n9_UOYHUHg0Yk1jviyHCYhJ0HbSxxQ>
Received-SPF: pass
    (outlook.com: Sender is authorized to use 'AniketVermaq@outlook.com' in 'mfrom' identity (mechanism 'include:spf.protection.outlook.com' matched))
    receiver=mx4.messagingengine.com;
    identity=mailfrom;
    envelope-from="AniketVermaq@outlook.com";
    helo=EUR02-VI1-obe.outbound.protection.outlook.com;
    client-ip=40.92.48.94
Received: from EUR02-VI1-obe.outbound.protection.outlook.com (mail-vi1eur02olkn2094.outbound.protection.outlook.com [40.92.48.94])
    (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
    (No client certificate requested)
    by mx4.messagingengine.com (Postfix) with ESMTPS id 02ECF640095
    for <dave@millermattson.com>; Thu,  1 Aug 2024 00:08:46 -0400 (EDT)
ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none;
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ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com;
 s=arcselector10001;
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From: Aniket Verma <AniketVermaq@outlook.com>
Subject: Re: Permission,
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Comments

2 responses to “The Evolution of Email Headers”

  1. Agustinus Lawandy Avatar
    Agustinus Lawandy

    Hi Dave,

    I got to know you from the masterpiece that is bio simulator video. Then I begin to appreciate your blog works such as one on self learning. I noticed that you are self employed for a decade now.

    How did you transition from normal corporate job to self employment? I have been working in corporate as a self taught Software Engineer for 6 years now, and while I like the job I am looking for becoming self employed myself.

    Would you be so kind to share your experience or even write a blog post on it?

    Reply
    1. Dave Avatar
      Dave

      Thanks for the comment. My wife and I made the escape from corporate employment at about the same time, unguided by reason or strategy. We accidentally discovered that part-time and short-term contract work through a contracting agency is great for networking. After a few years of contract jobs, we had contacts spread far and wide. Those contacts, combined with the grace and intelligence of my better half, generated an ongoing stream of opportunities for gig work. I believe self-employment is about networking and a passion for learning. You clearly have the passion. All the best wishes in your journey.

      Reply

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