Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

DNS/MX Issue Question

Posted on 2011-09-15
7
Medium Priority
?
375 Views
Last Modified: 2012-05-12
We have a client that is not receiving emails that our webserver is sending to them.  

Our server is not blacklisted, nor is it an SPF issue.  Emails are being delivered to every domain except for them.

I'm talking to their IT guy right now - and he's saying that his suspicion is (because there is no record that the emails have ever hit their server) that we are not sending to the right MX record for their domain.  

Now - I'm not really a DNS/Server guy (my thing is software) - but that doesn't make sense to me.

Correct me if I'm missing something...

We (my server) have nothing to do with the MX record of your server.  Nor do we have any control over what MX record is being sent to.  That's handled specifically by your DNS.  As such, we have no control over how the email is routed...as that's controlled specifically by your nameserver/DNS records you've set.

Isn't that correct?  Or - is there something we can do on our end that I'm somehow missing?
0
Comment
Question by:erzoolander
7 Comments
 
LVL 16

Expert Comment

by:uescomp
ID: 36543250
Well one this is for sure, they have to have a static because if its dynamic and their DNS changes they will not get anything.  The MX record I believe is held by whoever has the domain.
0
 
LVL 9

Expert Comment

by:davealford
ID: 36543260
You could have a corrupt DNS cache entry on the webserver sending the form.

If its a Windows server you can try ipconfig /flushdns

Also if a Windows server, try using

nslookup
set type=mx
"domain name"

Replace "domain name" with the target domain.
That should show what the server is sending to
0
 
LVL 3

Expert Comment

by:danlein
ID: 36543296
I agree as long as the address is correct, you have nothing to do with their MX records, have you tried to reply to an e-mail they sent? And if that does not work someone may have an enterprise rule issue with an anti-virus or firewall or possibly the mail server. Are you using exchange or POP, is he using a mail server or POP?
   
0
Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

 
LVL 2

Author Comment

by:erzoolander
ID: 36543380
They use microsoft forefront.

With respect to a corrupt DNS - we're on a linux box - and when I do an NSLookup - it shows the correct mail exchanger for them.
0
 
LVL 11

Accepted Solution

by:
Ross-C earned 2000 total points
ID: 36543410
I agree with you and danlein it's probably due to a firewall or email some kind of email filtering.
0
 
LVL 9

Expert Comment

by:davealford
ID: 36543537
can you telnet to the mx record on port 25 from the server?
0
 
LVL 16

Expert Comment

by:uescomp
ID: 36575546
Is the port open to allow incoming mail on your router?
0

Featured Post

Evaluating UTMs? Here's what you need to know!

Evaluating a UTM appliance and vendor can prove to be an overwhelming exercise.  How can you make sure that you're getting the security that your organization needs without breaking the bank? Check out our UTM Buyer's Guide for more information on what you should be looking for!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I will assume you are running a non-server version of some sort of Windows throughout this article. There are many flavors of Windows since Windows Server 2000 - 2008, XP Home & Pro, Vista Home & Pro, and Windows 7 Starter, Home, Pro, Ultimate, etc.…
I've written instructions for one router type, but this principle may be useful for others of the same brand and even other brands of router. Problem: I had an issue especially with mobile devices that refused to use DNS information supplied via…
This lesson discusses how to use a Mainform + Subforms in Microsoft Access to find and enter data for payments on orders. The sample data comes from a custom shop that builds and sells movable storage structures that are delivered to your property. …
With just a little bit of  SQL and VBA, many doors open to cool things like synchronize a list box to display data relevant to other information on a form.  If you have never written code or looked at an SQL statement before, no problem! ...  give i…
Suggested Courses
Course of the Month11 days, 16 hours left to enroll

564 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question