<div>
Do a check to make sure the domains aren't RBL'ed here:<br />
<br />
<a href="http://www.anti-abuse.org/multi-rbl-check/" rel="ugc">http://www.anti-abuse.org/multi-rbl-check/</a>
</div>


Do a check to make sure the domains aren't RBL'ed here:

http://www.anti-abuse.org/multi-rbl-check/ [http://www.anti-abuse.org/multi-rbl-check/]

<div>
As per NDR 4.4.2 its looks like a network issue server trying to send a mail but connection was broken..<br />
<br />
Also i would suggest you to if you are using any thrid party applinace at gateway lable please check the log might help you to understand the issue.
</div>


As per NDR 4.4.2 its looks like a network issue server trying to send a mail but connection was broken..

Also i would suggest you to if you are using any thrid party applinace at gateway lable please check the log might help you to understand the issue.

<div>
nothing found in the log of the firewall appliance
</div>


nothing found in the log of the firewall appliance

<div>
Error reading SMTP packet; response to RCPT TO command expected
</div>


Error reading SMTP packet; response to RCPT TO command expected

<div>
<div class="content wysiwyg-content">
hi experts<br />
i have problem in receiving from specific domains<br />
the following was received to the other domain users : -<br />
<br />
Reporting-MTA: dns; mx4.itsroot.net<br />
Final-recipient: RFC822; user@mydomain.com<br />
Action: delayed<br />
Status: 5.4.0<br />
X-Supplementary-Info: &lt;&nbsp;#4.4.2 X-Postfix; conversation with mail.mydomain.com[X.X.X.X]<wbr /> timed out while sending RCPT TO&gt;
</div>
</div>


hi experts
i have problem in receiving from specific domains
the following was received to the other domain users : -

Reporting-MTA: dns; mx4.itsroot.net
Final-recipient: RFC822; user@mydomain.com
Action: delayed
Status: 5.4.0
X-Supplementary-Info: < #4.4.2 X-Postfix; conversation with mail.mydomain.com[X.X.X.X] timed out while sending RCPT TO>

Exchange 2010

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

Microsoft Forefront, formerly known as Internet Security and Acceleration Server (ISA Server), is a network router, firewall, antivirus program, VPN server and web cache that runs on Windows servers. It includes identity management and protection systems, and discontinued systems for threat management and network protection, along with protection for Sharepoint and Exchange. The scope of discussions includes forward and reverse proxy, application and service publishing, virtual private networks (VPNs), outbound access rules, SSL certificates and network routing within either a single node or an highly-available array pairing.

Microsoft Forefront ISA Server

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.