<div>
what if you type just HELO, not HELO domain.com
</div>


what if you type just HELO, not HELO domain.com

<div>
Do u have a Cisco router or mail guard?
</div>


<div>
Hi,<br />
<br />
That is usually caused by something getting in the way and blocking the traffic. AV, Firewall scanning SMTP traffic, try to disable Antivirus on exchange server and perform telnet.<br />
<br />
and also there is one more tool available to check SMTP settings using Microsoft exchange Connectivity:<br />
<br />
<a href="https://testconnectivity.microsoft.com/" rel="ugc nofollow">https://testconnectivity.microsoft.com/</a><br />
<br />
Regards,<br />
Arjun
</div>


Hi,

That is usually caused by something getting in the way and blocking the traffic. AV, Firewall scanning SMTP traffic, try to disable Antivirus on exchange server and perform telnet.

and also there is one more tool available to check SMTP settings using Microsoft exchange Connectivity:

https://testconnectivity.microsoft.com/ [https://testconnectivity.microsoft.com/]

Regards,
Arjun

<div>
That is classic Cisco ASA device.<br />
<a href="http://support.microsoft.com/kb/320027" rel="ugc">http://support.microsoft.com/kb/320027</a><br />
<br />
You need to disable the SMTP scanning functionality on the firewall. <br />
<br />
Simon
</div>


That is classic Cisco ASA device.
http://support.microsoft.com/kb/320027 [http://support.microsoft.com/kb/320027]

You need to disable the SMTP scanning functionality on the firewall.

Simon

<div>
<div class="content wysiwyg-content">
I have a 2007 exchange server and I need to test smtp.<br />
<br />
I tried using telnet to mailserver.domain.com 25 and I get the 220*************<br />
<br />
but when I type helo domain.com I get 503 unrecognized command.<br />
<br />
How to test smtp through telnet?
</div>
</div>


I have a 2007 exchange server and I need to test smtp.

I tried using telnet to mailserver.domain.com 25 and I get the 220*************

but when I type helo domain.com I get 503 unrecognized command.

How to test smtp through telnet?

How to test smtp on exchange 2007

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 Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.