Sender Email-Id is different from Display Email-Id

I have a Exchange 2013 with a Firewall DLINK DFL-800 in front of it.

Some messages from the internet could not be received - they return to the senders the following error:

SMTP error from remote mail server after end of data:
     host mail.phoenixy.ro [82.79.166.37]: 554 Transaction Failed:
     Sender Email-Id is different from Display Email-Id

This is a Exchange error (from Malware scaning) or it is from the firewall in front of it ?

Thank you in advance,

Teodor
Teodor MargaritAsked:
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Teodor MargaritConnect With a Mentor Author Commented:
Solved the problem, it was the SMTP ALG  in the Firewall device.
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Ben HartCommented:
Do the Reply-To and Sent From addresses match on the original email?
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Teodor MargaritAuthor Commented:
Yes, the email was sent from a web client (from the domain pufuletigusto.ro, using RoundCube) to the Exchange server (phoenixy.ro):

-------- Mesaj original --------
Subiect: Mail delivery failed: returning message to sender
Data: 2015-01-06 15:09
Expeditor: Mail Delivery System <Mailer-Daemon@rg2.gazduire.ro>
Destinatar: office@pufuletigusto.ro

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

   cristinaardeleanu@phoenixy.ro
     SMTP error from remote mail server after end of data:
     host mail.phoenixy.ro [82.79.166.37]: 554 Transaction Failed:
     Sender Email-Id is different from Display Email-Id".

------ This is a copy of the message, including all the headers. ------
------ The body of the message is 184151 characters long; only the first
------ 106496 or so are included here.

Return-path: <office@pufuletigusto.ro>
Received: from localhost ([127.0.0.1]:40576 helo=rg2.gazduire.ro)
      by rg2.gazduire.ro with esmtpa (Exim 4.82)
      (envelope-from <office@pufuletigusto.ro>)
      id 1Y8Tt2-002ehI-0D
      for cristinaardeleanu@phoenixy.ro; Tue, 06 Jan 2015 15:09:29 +0200
MIME-Version: 1.0
Content-Type: multipart/mixed;
  boundary="=_77b223cc3aa06722c1748c4a88b25df5"
Date: Tue, 06 Jan 2015 15:09:27 +0200
 From: office@pufuletigusto.ro
To: cristinaardeleanu@phoenixy.ro
Subject: Fwd: RE: fact marfa
Message-ID: <24c0f99177ef6db8c313c56af191c273@pufuletigusto.ro>
X-Sender: office@pufuletigusto.ro
User-Agent: Roundcube Webmail/0.9.5
X-cPanel-MailScanner-Information: Please contact the ISP for more
information
X-cPanel-MailScanner-ID: 1Y8Tt2-002ehI-0D
X-cPanel-MailScanner: Not scanned: please contact your Internet E-Mail
Service Provider for details
X-cPanel-MailScanner-SpamCheck:
X-cPanel-MailScanner-From: office@pufuletigusto.ro
X-Spam-Status: No

--=_77b223cc3aa06722c1748c4a88b25df5
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=UTF-8;
  format=flowed
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Teodor MargaritAuthor Commented:
It was a setting in the Firewall device, not Exchange.
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