Help interpreting spam email

I have one old server that serves three web sites and I honestly haven't touched it in years. Today it's gotten some spam email and I've forgotten how to interpret these things and I don't know if it's an issue on my part or not (that is, something I can do anything about) or if it's just bounce back mail. I'm using sendmail.

My impression is that this is a return email for spam sent to "patrick" through Google. Our mail server is "mysite.com"

From MAILER-DAEMON Wed Mar 9 09:54:53 2016
Date: Wed, 9 Mar 2016 09:54:53 -0600 (CST)
From: Mail Delivery Subsystem <MAILER-DAEMON>
To: postmaster
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="u29FsqH6076594.1457538893/localhost.mysite.com"
Subject: Postmaster notify: see transcript for details
Auto-Submitted: auto-generated (postmaster-notification)

This is a MIME-encapsulated message

--u29FsqH6076594.1457538893/localhost.mysite.com

The original message was received at Wed, 9 Mar 2016 09:54:52 -0600 (CST)
from localhost
with id u29FsqH5076594

----- The following addresses had permanent fatal errors -----
<HartmanHarriet56834@barak-online.net>
(reason: 550 5.1.1 unknown or illegal alias: HartmanHarriet56834@barak-online.net)

----- Transcript of session follows -----
... while talking to mx20.013net.net.:
>>> DATA
<<< 550 5.1.1 unknown or illegal alias: HartmanHarriet56834@barak-online.net
550 5.1.1 <HartmanHarriet56834@barak-online.net>... User unknown
<<< 554 5.5.0 No recipients have been specified.

--u29FsqH6076594.1457538893/localhost.mysite.com
Content-Type: message/delivery-status

Reporting-MTA: dns; localhost.mysite.com
Received-From-MTA: DNS; 82-166-240-203.barak-online.net
Arrival-Date: Wed, 9 Mar 2016 09:54:52 -0600 (CST)

Final-Recipient: RFC822; HartmanHarriet56834@barak-online.net
Action: failed
Status: 5.1.1
Remote-MTA: DNS; mx20.013net.net
Diagnostic-Code: SMTP; 550 5.1.1 unknown or illegal alias: HartmanHarriet56834@barak-online.net
Last-Attempt-Date: Wed, 9 Mar 2016 09:54:53 -0600 (CST)

--u29FsqH6076594.1457538893/localhost.mysite.com
Content-Type: message/rfc822

Return-Path: <MAILER-DAEMON>
Received: from localhost (localhost)
by localhost.mysite.com (8.15.2/8.15.2) id u29FsqH5076594;
Wed, 9 Mar 2016 09:54:52 -0600 (CST)
(envelope-from MAILER-DAEMON)
Date: Wed, 9 Mar 2016 09:54:52 -0600 (CST)
From: Mail Delivery Subsystem <MAILER-DAEMON>
Message-Id: <201603091554.u29FsqH5076594@localhost.mysite.com>
To: <HartmanHarriet56834@barak-online.net>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="u29FsqH5076594.1457538892/localhost.mysite.com"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)

This is a MIME-encapsulated message

--u29FsqH5076594.1457538892/localhost.mysite.com

The original message was received at Wed, 9 Mar 2016 09:54:51 -0600 (CST)
from 82-166-240-203.barak-online.net [82.166.240.203] (may be forged)

----- The following addresses had permanent fatal errors -----
<patrick@myhostedsite.com>
(reason: 552-5.7.0 This message was blocked because its content presents a potential)

----- Transcript of session follows -----
... while talking to gmail-smtp-in.l.google.com.:
>>> DATA
<<< 552-5.7.0 This message was blocked because its content presents a potential
<<< 552-5.7.0 security issue. Please visit
<<< 552-5.7.0 https://support.google.com/mail/answer/6590 to review our message
<<< 552 5.7.0 content and attachment content guidelines. o67si2743605ywf.256 - gsmtp
554 5.0.0 Service unavailable

--u29FsqH5076594.1457538892/localhost.mysite.com
 
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