Spoofing email addresses is trivial and a well-known weakness of the protocol. It can only be combated vi SPF records and there are so many tweaks that's ridiculous (and sad)... :( ET

Matthew Crews writes:
More than likely you were not hacked, but rather a drive by spammer tried
to use your email address for their purposes. Surprisingly easy to do, and
surprisingly easy to detect. Of course, it never hurts to change your Google password and enable 2FA.
On Sun, Jan 29, 2017, 09:45 Mark Phillips <[email protected]>
wrote:
I found the Mail Deliver Subsytem notification (see below) in my Gmail
inbox this morning. Has my account been hacked?
The message says an email from my account could not be delivered because
the destination address was incorrect. The email message that bounced was
in Italian and looks like spam (based on my limited Italian). I never sent
the message and I don't write enough Italian to be able to spam anyone in
that language.
I only access this Gmail account with a browser from (1) my Ubuntu 14.04
machine or with the Gmail app on my Android phone and tablet. Any
suggestions on how to find any malware on my Ubuntu machine or my Android
machines that could have sent this message? Thanks!
Mark
==============================================================
The suspicious message:
Phillips Marketing, Inc. Mail    Mark Phillips <[email protected]
>
Delivery Status Notification (Failure)
Mail Delivery Subsystem <[email protected]>    Sun, Jan 29,
2017 at 12:51 AM
To: [email protected]
Error Icon
Address not found
Your message wasn't delivered to [email protected] because the
address couldn't be found. Check for typos or unnecessary spaces and try
again.
Final-Recipient: rfc822; [email protected]
Action: failed
Status: 5.0.0
Last-Attempt-Date: Sat, 28 Jan 2017 23:51:21 -0800 (PST)

---------- Forwarded message ----------
From: <[email protected]>
To: <[email protected]>
Cc:
Date: 29 Jan 2017 13:16:17 +0200
Subject: Guadagni extra per voi! 700-1000 euros alla settimana.
Caro hlrecherche,
Io sono HR manager di una grande compagnia internazionale.
La nostra azienda &#232; alla ricerca di collaboratori intraprendenti. Il stipendio possibile da 2500 a 5000 euro al mese.
Se Le interessa nostra offerta - si prega di visitare il
Nostro Sito
Con i migliori saluti,
HR Manager
Ufficio Internazionale
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