<div>
Your ironport hss been set up with an ip which your network owner has apprently declared not to be used by MTAs<br />
See here: <a href="https://www.spamhaus.org/pbl/" rel="ugc">https://www.spamhaus.org/pbl/</a><br />
<br />
Some solution pths would be<br />
Open a support ticket woth your provider/ change ip / use a smarthost provided by your provider
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Your ironport hss been set up with an ip which your network owner has apprently declared not to be used by MTAs
See here: https://www.spamhaus.org/pbl/ [https://www.spamhaus.org/pbl/]

Some solution pths would be
Open a support ticket woth your provider/ change ip / use a smarthost provided by your provider

Navishkar Sadheo

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Hi Michelangelo. Thanks for your reply. So my ISP should ideally &nbsp;flag that IP as being a MTA? Let me log a ticket with them.
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Hi Michelangelo. Thanks for your reply. So my ISP should ideally  flag that IP as being a MTA? Let me log a ticket with them.

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Probable cause &amp;&nbsp;resolution provided
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<div class="content wysiwyg-content">
Dear Experts<br />
<br />
Please can someone assist me.<br />
<br />
The public IP of my IronPort keeps getting blacklisted.<br />
<br />
I have an Exchange 2010 environment with Cisco IronPorts used as my MTAs.<br />
<br />
I have attached the error message.<br />
<br />
They keep talking about &quot;direct-to-mx&quot;.<br />
<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/05_w21/1319994/2018-05-24-10_36_44-Connections---TT.png" target="_blank" title="My send org send connector (36 KB)"><img alt="My send org send connector" class="file-block lazyload" style="max-width: 624px;" data-src="https://filedb.experts-exchange.com/incoming/2018/05_w21/1319994/2018-05-24-10_36_44-Connections---TT.png" /></a><a href="https://filedb.experts-exchange.com/incoming/2018/05_w21/1319987/2018-05-24-10_15_31-The-Spamhaus-Pro.png" target="_blank" title="The Error (52 KB)"><img alt="The Error" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2018/05_w21/800_1319987/2018-05-24-10_15_31-The-Spamhaus-Pro.png" /></a>
</div>
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2018-05-24-10_15_31-The-Spamhaus-Pro.png

2018-05-24-10_36_44-Connections---TT.png

Dear Experts

Please can someone assist me.

The public IP of my IronPort keeps getting blacklisted.

I have an Exchange 2010 environment with Cisco IronPorts used as my MTAs.

I have attached the error message.

They keep talking about "direct-to-mx".




&quot;direct-to-mx&quot; IP keeps getting blacklisted.

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

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.

AntiSpam

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.

Email Servers

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).

&quot;direct-to-mx&quot; IP keeps getting blacklisted.

"direct-to-mx" IP keeps getting blacklisted.