<div>
Check SMTP on <a href="http://mxtoolbox.com" rel="ugc">http://mxtoolbox.com</a>
</div>


Check SMTP on http://mxtoolbox.com [http://mxtoolbox.com]

<div>
<div class="content wysiwyg-content">
I have an exchange 2007 installed with content filter activated and also the antispam feature, and sometimes i have user saying that there are complains from people that are trying to send email to them that they get the following message:<br />
<br />
Reason: SMTP transmission failure has occurred<br />
Diagnostic code: smtp;554 5.6.0 Invalid content<br />
Remote system.........Microsoft ESMTP MAIL Service ready at Wed, 16 Jan 2013 15:39:26 +0100)<br />
<br />
Any ideas on how to solve this issue?
</div>
</div>


I have an exchange 2007 installed with content filter activated and also the antispam feature, and sometimes i have user saying that there are complains from people that are trying to send email to them that they get the following message:

Reason: SMTP transmission failure has occurred
Diagnostic code: smtp;554 5.6.0 Invalid content
Remote system.........Microsoft ESMTP MAIL Service ready at Wed, 16 Jan 2013 15:39:26 +0100)

Any ideas on how to solve this issue?

Exchange 2007 rejecting messages

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.