Email from some users not being received

I have and Exchange Server 2003 fully patched working fine. We have two email domains that the server is responsible  for. Address B works perfectly, all mail sent to all recipients is received.

However when mail is sent to the same recipients using email address B some senders get the following bounce:

Your message did not reach some or all of the intended recipients.

      Subject:      test
      Sent:      05/02/2013 09:13

The following recipient(s) cannot be reached:

      postmaster@domain.org on 05/02/2013 09:10
            The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.
            < box7.911domain.com #5.1.1 SMTP; 550 No Such User Here>


If I send the same message to the same address using a yahoo mail account, it works fine.
Mark_CollingeAsked:
Who is Participating?
 
Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
That isn't an Exchange NDR.
Therefore the email is being delivered to the wrong server, or rejected by something other than Exchange.
Check your MX records are correct, they should only have the Exchange server listed. If you have third party software installed then ensure that it is configured correctly.

Simon.
0
 
Mark_CollingeAuthor Commented:
Thanks Simon,


I have asked for control panel login details for the domain and will look at the MX records, I am sure that the exchange server is not the issue as the other domain email works perfectly.
0
 
Ben HartCommented:
Is box7.911domain a server inside your organization?  Do you have a Smart host?
0
Has Powershell sent you back into the Stone Age?

If managing Active Directory using Windows Powershell® is making you feel like you stepped back in time, you are not alone.  For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why.

 
Mark_CollingeAuthor Commented:
Is box7.911domain a server inside your organization?  Do you have a Smart host?

No and no.
0
 
RJ_EmmettCommented:
I agree with Sembee2.  Check your mx records at mxtoolbox.com
0
 
SubsunCommented:
If I send the same message to the same address using a yahoo mail account, it works fine.
IMO The NDR posted is customized and it doesn't really explain what exactly the problem is.. If the mails are getting rejected only from your domain for this email address then you might need to contact the box7.911domain.com administrator and ask them to check why address is not accepting emails from your domain and fix it
0
 
Mark_CollingeAuthor Commented:
What should I be looking for on mx toolbox? It shows the mx record pointing to the IP address of the server...
0
 
RJ_EmmettCommented:
On MXtoolbox check to make sure your DNS sesttings are accurate, you have a reverse DNS lookup entry and a SPF record.  This is a good site to start with to find possible issues with how you have DNS setup.
0
 
Ben HartCommented:
what I'm not understanding is.. box7.911domain.com (unless that was renamed to protect the innocent) is what's stating that there's no such user.  If you do not use a Smart Host and that box is not inside your domain.. why is it even in the loop here? rogue MX maybe?
0
 
Ben HartCommented:
Oh and on MX Toolbox, make sure that when checking your own domain (or the domain your server is responsible for) that only the servers/IP's returned belong to your server(s).  Also verify whether or not your reverse is resolving correctly.
0
 
I QasmiTechnical LeadCommented:
It seems that  box7.911domain.com is your smarhost provider and the users rejected are either not added to the list for mailflow or  box7.911domain.com smtp 25 port is not responding also check for 587 port as usually smarthosts work on this port also
.
0
 
Mark_CollingeAuthor Commented:
There were some historical mailboxes and a spurious MX entry, once deleted things work fine!
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.