We help IT Professionals succeed at work.
Get Started

Verify DNS records for owa and mail A records - email not being delivered

jsvor
jsvor asked
on
1,922 Views
Last Modified: 2012-05-05
I have been contacted by an admin from a local company saying that they are not able to send mail to our domain.com email addresses.  They receive an NDR eventually that says the following:

The following recipient(s) could not be reached:

      user@domain.com on 3/24/2007 11:13 AM
            The e-mail system was unable to deliver the message, but did not report a specific reason.  Check the address and try again.  If it still fails, contact your system administrator.

            < s001.OTHERDOMAIN.COM #4.0.0 X-Postfix; lost connection with    mail.domain.com [123.123.123.115] while performing the initial protocol    handshake>

The admin says that their Sophos mail server shows logs that the mail is trying to be delivered to owa.domain.com instead of mail.domain.com.  He thinks that my DNS settings for domain.com are not setup correctly and thinks I need to fix it.  I have not heard of any other complaints from other companies not able to contact us via email.  

I am trying to determine if my DNS settings are correct for my setup or if I need to change them.  Since I have the same IP set for owa.domain.com and mail.domain.com the admin believes I need to obtain another IP address from my ISP and set owa.domain.com to it.  Is that necessary?  Let me know if you need any more information.

I have a setup as follows:

Public IP: 123.123.123.115
domain: domain.com

-Small office with SBS 2003, using Exchange for domain emails - domain.com.  The Exchange server is setup for OWA from the external network so that users can access their mail by going to https://owa.domain.com/exchange.  
-Windows 2003 Server with ISA Server 2006 as firewall connected directly to internet connection.  Port 25 is opened and forwarded to SBS server for mail delivery.  Traffic for owa is also forwarded to SBS server.

-------DNS Records---------
Subdomain: .
Type:  NS
Value:  ns1.s422.sureserver.com
TTL:  25920

Subdomain: .
Type:  NS
Value:  ns2.s422.sureserver.com
TTL:  25920

Subdomain: owa
Type:  A
Value:  123.123.123.115
TTL:  14400

Subdomain: .
Type:  A
Value:  234.234.234.142
TTL:  14400

Subdomain: *
Type:  A
Value:  234.234.234.142
TTL:  14400
 
Subdomain: mail
Type:  A
Value:  123.123.123.115
TTL:  14400

Subdomain: .
Type:  MX
Value:  mail.domain.com
TTL:  14400

Comment
Watch Question
President
CERTIFIED EXPERT
Commented:
This problem has been solved!
Unlock 2 Answers and 14 Comments.
See Answers
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE