We help IT Professionals succeed at work.

We've partnered with Certified Experts, Carl Webster and Richard Faulkner, to bring you a podcast all about Citrix Workspace, moving to the cloud, and analytics & intelligence. Episode 2 coming soon!Listen Now


Exchange server do not receive emails

zaldivar05 asked
Medium Priority
Last Modified: 2010-04-08
My exchange server do not receive emails. There is not a problem of connection, we can telnet the port 25 of our server from outside.

When we telnet the port 25 we can not see what we write at the command prompt, when I write I only can see blanks and "-"

what can be wrong?

Watch Question



You need to define mx records for your email server. For examle if your domain is 'halo.com' your mx record must be created with the <pc name>.halo.com, something like mail.halo.com.

you can see if your mx records are in place by doing a nslookup.

At command prompt type Nslookup

set q=any
<your domain name here>

once you enter this if your settings are done correctly, you should see the records for your site. Best to do this from outside your network.

There may be many reasons why you may not get emails. If the DNS servers were only configured right now, the settings take upto 48 hours to propagate. Your server may not be set up properly. Your firewall or router may need to be set up. We would like more information about your environment.

In windows you can type 'telnet mail.halo.com 25' and use the telnet facility from there. Here what you type will not be visible.

You can also just type Telnet and enter at command prompt to get a different Telnet facility.

We use putty.exe to Telnet. It is very easy to use and you can see what you type.



it is not a DNS problem, the server can be reach from outside without problems.


could you give more background information. Is there a firewall? Is there a router? Are these configured?

Have you set up the Mail Protocols in Exchange?

It's a bit tough without the exact details as to how you had set up exchange and your environment info....

You can also use the dnsreport and email test to check for errors. At www.dnsreport.com, if you could post your domain, we could check from outside.


thx for all the help, the problem was that we were using freeproxy and this program was blocking the port 25.

So it turned out to be a configuration problem after all. Glad you were able to resolve it. Appreciate if you could close the question.



Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts
Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.