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Получение отказов электронной почты для писем, которые я никогда не отправлял

Я уже пару раз замечал, что получаю Delivery Status Notification (Failure) электронные письма для писем, которые я не отправлял. Меня беспокоит, что кто-то другой использует мою учетную запись для рассылки спама, но мои знания о подобных вещах ограничены.

Вот моя установка:

Сказанное выше вселило в меня уверенность в том, что мне не нужно беспокоиться об электронной почте. Google брался за тяжелые вещи, а я настраивал систему безопасности, чтобы удовлетворить свой аппетит к риску.

Вот пример одного из полученных мной писем:

Delivered-To: dropbox@williammayor.co.uk
Received: by 10.28.230.77 with SMTP id d74csp2527957wmh;
        Thu, 16 Feb 2017 05:56:46 -0800 (PST)
X-Received: by 10.28.51.205 with SMTP id z196mr12396419wmz.22.1487253406837;
        Thu, 16 Feb 2017 05:56:46 -0800 (PST)
Return-Path: <>
Received: from mail-wm0-x244.google.com (mail-wm0-x244.google.com. [2a00:1450:400c:c09::244])
        by mx.google.com with ESMTPS id z26si7277207wrz.96.2017.02.16.05.56.46
        for <dropbox@williammayor.co.uk>
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Thu, 16 Feb 2017 05:56:46 -0800 (PST)
Received-SPF: pass (google.com: best guess record for domain of postmaster@mail-wm0-x244.google.com designates 2a00:1450:400c:c09::244 as permitted sender) client-ip=2a00:1450:400c:c09::244;
Authentication-Results: mx.google.com;
       dkim=pass header.i=@googlemail.com;
       spf=pass (google.com: best guess record for domain of postmaster@mail-wm0-x244.google.com designates 2a00:1450:400c:c09::244 as permitted sender) smtp.helo=mail-wm0-x244.google.com;
       dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=googlemail.com
Received: by mail-wm0-x244.google.com with SMTP id r18so3245363wmd.3
        for <dropbox@williammayor.co.uk>; Thu, 16 Feb 2017 05:56:46 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
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         :in-reply-to:message-id:date;
        bh=mZaso4RaS6Rf+0QVb1hTu2CwYlfXSyEt+yTtW7hR8uk=;
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         KvIw==
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X-Received: by 10.28.194.5 with SMTP id s5mr1688371wmf.98.1487253406629;
        Thu, 16 Feb 2017 05:56:46 -0800 (PST)
Content-Type: multipart/report; boundary=001a114b06eefe38320548a62ae8; report-type=delivery-status
Return-Path: <>
Received: by 10.28.194.5 with SMTP id s5mr1816172wmf.98; Thu, 16 Feb 2017
 05:56:46 -0800 (PST)
From: Mail Delivery Subsystem <mailer-daemon@googlemail.com>
To: dropbox@williammayor.co.uk
Auto-Submitted: auto-replied
Subject: Delivery Status Notification (Failure)
References: <58A56946.2178.568202@dropbox.williammayor.co.uk>
In-Reply-To: <58A56946.2178.568202@dropbox.williammayor.co.uk>
Message-ID: <58a5af9e.05c21c0a.9a844.2280.GMRIR@mx.google.com>
Date: Thu, 16 Feb 2017 05:56:46 -0800 (PST)

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Content-Type: text/plain; charset=UTF-8


** Address not found **

Your message wasn't delivered to th3801@gone.bristol.ac.uk because the address couldn't be found. Check for typos or unnecessary spaces and try again.

Learn more here: https://support.google.com/mail/?p=NoSuchUser

The response from the remote server was:
550 5.1.1 The email account that you tried to reach does not exist. Please try double-checking the recipient's email address for typos or unnecessary spaces. Learn more at https://support.google.com/mail/?p=NoSuchUser y128si668637wme.153 - gsmtp

--001a114b06eefe38aa0548a62aea
Content-Type: text/html; charset=UTF-8


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<img style="padding:0 24px 16px 0;float:left" width=72 height=72 alt="Error Icon" src="cid:icon.png">
<table style="min-width:272px;padding-top:8px"><tbody>
<tr><td><h2 style="font-size:20px;color:#212121;font-weight:bold;margin:0">
Address not found
</h2></td></tr>
<tr><td style="padding-top:20px;color:#757575;font-size:16px;font-weight:normal;text-align:left">
Your message wasn't delivered to <a style='color:#212121;text-decoration:none'><b>th3801@gone.bristol.ac.uk</b></a> because the address couldn't be found. Check for typos or unnecessary spaces and try again.
</td></tr>
<tr><td style="padding-top:24px;color:#4285F4;font-size:14px;font-weight:bold;text-align:left">
<a style="text-decoration:none" href="https://support.google.com/mail/?p=NoSuchUser">LEARN MORE</a>
</td></tr>
</tbody></table>
</td></tr>
</tbody></table>
</td></tr>
<tr style="border:none;background-color:#fff;font-size:12.8px;width:90%">
<td align="left" style="padding:48px 10px">
The response from the remote server was:<br/>
<p style="font-family:monospace">
550 5.1.1 The email account that you tried to reach does not exist. Please try double-checking the recipient&#39;s email address for typos or unnecessary spaces. Learn more at https://support.google.com/mail/?p=NoSuchUser y128si668637wme.153 - gsmtp
</p>
</td>
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</tbody></table>
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Content-Type: message/delivery-status

Reporting-MTA: dns; googlemail.com
Received-From-MTA: dns; dropbox@williammayor.co.uk
Arrival-Date: Thu, 16 Feb 2017 05:56:46 -0800 (PST)
X-Original-Message-ID: <58A56946.2178.568202@dropbox.williammayor.co.uk>

Final-Recipient: rfc822; th3801@gone.bristol.ac.uk
Action: failed
Status: 5.1.1
Remote-MTA: dns; aspmx.l.google.com. (64.233.184.27, the server for the domain gone.bristol.ac.uk.)
Diagnostic-Code: smtp; 550-5.1.1 The email account that you tried to reach does not exist. Please try
 550-5.1.1 double-checking the recipient's email address for typos or
 550-5.1.1 unnecessary spaces. Learn more at
 550 5.1.1  https://support.google.com/mail/?p=NoSuchUser y128si668637wme.153 - gsmtp
Last-Attempt-Date: Thu, 16 Feb 2017 05:56:46 -0800 (PST)

--001a114b06eefe38320548a62ae8
Content-Type: message/global

X-Google-DKIM-Signature: v=3D1; a=3Drsa-sha256; c=3Drelaxed/relaxed;
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        Thu, 16 Feb 2017 05:56:46 -0800 (PST)
X-Received: by 10.28.194.5 with SMTP id s5mr1688348wmf.98.1487253406319;
        Thu, 16 Feb 2017 05:56:46 -0800 (PST)
Return-Path: <dropbox@williammayor.co.uk>
Received: from mail-wr0-f197.google.com (mail-wr0-f197.google.com. [209.85.=
128.197])
        by mx.google.com with ESMTPS id f200si612772wme.108.2017.02.16.05.5=
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        Thu, 16 Feb 2017 05:56:46 -0800 (PST)
Received-SPF: neutral (google.com: 209.85.128.197 is neither permitted nor =
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t-ip=3D209.85.128.197;
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Received: by mail-wr0-f197.google.com with SMTP id y7so3180714wrc.7
        for <th3801@my.bristol.ac.uk>; Thu, 16 Feb 2017 05:56:46 -0800 (PST=
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or.co.uk
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Received: from [190.67.150.7] ([190.67.150.7])
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3
        for <th3801@bris.ac.uk>;
        Thu, 16 Feb 2017 05:56:45 -0800 (PST)
Received-SPF: neutral (google.com: 190.67.150.7 is neither permitted nor de=
nied by best guess record for domain of dropbox@williammayor.co.uk) client-=
ip=3D190.67.150.7;
From: <dropbox@williammayor.co.uk>
To: <th3801@bris.ac.uk>
Date: 16 Feb 2017 02:22:38 -0600
MIME-Version: 1.0
Subject: Local representation needed for the International Company
Message-ID: <58A56946.2178.568202@dropbox.williammayor.co.uk>
Priority: normal
X-mailer: Pegasus Mail for Windows (4.61)
Content-type: multipart/alternative; boundary=3D"Alt-Boundary-29754.9314526=
"

Dear th3801,

We are looking for employees working remotely.

My name is Major, I am the personnel manager of a large International compa=
ny.
Most of the work you can do from home, that is, at a distance.

Salary is $2200-$5400.

If you are interested in this offer, please visit=20
Our Site

d_healthBest regards!
--001a114b06eefe38320548a62ae8--

Как видите, письмо отправлено с адреса dropbox@williammayor.co.uk, это не настоящий адрес электронной почты. В моем домене настроен псевдоним с подстановочными знаками, поэтому я могу регистрировать учетные записи, не раскрывая свой фактический адрес. Кажется, кто-то нашел мой Dropbox One?

Исходное письмо - это спам / мошенничество об удаленной работе. Отправлено на счет Бристольского университета.

Мои мысли:

  1. Кто-то отправляет электронные письма и подделывает мой адрес электронной почты
  2. Кто-то пытается заставить меня думать, что они это делают

В чем дело? Как мне это остановить? Какие ошибки я сделал здесь? Я полагаюсь на Google Apps, чтобы позаботиться о сложных моментах, и меня беспокоит, что я упустил что-то важное (особенно учитывая, что я управляю другими ИТ-инфраструктурами с помощью Google Apps).

Спасибо!