receiving undeliverable email message

I am using exchange 2010 I have an email client who is receiving the undeliverable mail message at least 5 times for emails she is not sending.
wyn66Asked:
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Thomas GrassiSystems AdministratorCommented:
Make sure your connectors are not a relay


Get-ReceiveConnector | Get-ADPermission -User “NT Authority\Anonymous Logon” | Where-Object {$_.ExtendedRights -like “ms-Exch-SMTP-Accept-Any-Recipient”} | Format-List Identity,ExtendedRights
Arjun VyavahareTechnical ConsultantCommented:
will u share us the undeliverable message in detail, may be ur public ip address is blacklisted. To checj Public IP is blacklisted or not go to -

www.mxtoolbox.com

and type ur public ip address into Blacklisted option.

Regards,
Arjun
David Johnson, CD, MVPOwnerCommented:
if these messages are not coming from her machine/account as determined by checking the message headers then someone has just picked her email address at random and she is getting the NDR's. Time to start detective work and analyse the headers
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Viral RathodConsultantCommented:
Yes Please share the NDR which will help us to identify the root cause.

also

1) Make sure your server is not an open relay .
2) Recheck the Exchange IMF/Content Filter settings.
wyn66Author Commented:
here is header info of one of the emails. it is not coming from her box because i had it turned off the entire weekend.
S.thomasemail1.rtf
wyn66Author Commented:
i'm going to share point with all. i change the password on her account and she is getting no more messages. i believe her account was compromised by some site she went on.
David Johnson, CD, MVPOwnerCommented:
the sender is Huesgen 12.156.188.152
marchmail.com is on a blacklist

gmx.net #550 Requested action not taken      mailbox unavailable ##
From      Schulz AG <s.thomas@columbiataxcollector.com>
To      Markus Christian Rock <markus-christian.rock@gmx.de>
Subject      Arbeitsagentur Online stellt neue Arbeitsstellen vor
Date      Mon, 20 Apr 2015 09:32:30 +0000
Reply-To      <GylesAvagest@marchmail.com>
Message-ID      <14350824.1c6bce880cf8a7a4@Huesgen>
MIME-Version      1.0
Content-Type      text/plain; format=flowed; charset="utf-8"
Content-Transfer-Encoding      quoted-printable
Return-Path      s.thomas@columbiataxcollector.com
X-TM-AS-Product-Ver      SMEX-11.1.0.1239-7.500.1018-21490.003
X-TM-AS-Result      No-3.249800-4.000000-31
X-TM-AS-User-Approved-Sender      No
X-TM-AS-User-Blocked-Sender      No

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