DNS records

[joepc]

I am think I am having some DNS issues with my Domain. I am running SMB Server 2003 and using exchange. I can send/recieve mail to/from almost everybody execpt from 5 people or so. Some can send us mail and we can't send back and vise versa.

This what I have for DNS records:

MX otherdomain.com 64.80.X.X
MX mail.otherdomain.com 64.80.X.X

A otherdoamin.com 64.80.X.X

Could the A & MX record confilict???



This is the NDR I am getting. (changed names for privacy reasons)

Reporting-MTA: dns;ngi2.us

Final-Recipient: rfc822; reciepient@somedomain.com
Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;550-Verification failed for <sender@otherdomain.us>
550-unrouteable mail domain "otherdomain.us"
550 Sender verify failed
X-Display-Name: reciepient@somedomain.com


Any ideas would be great

 

[joepc]

This is more accurate DNS info:


otherdoamin.us MX priority 1
otherdoamin.us A

mail.otherdoamin.us MX priority 2
mail.otherdoamin.us A

Does it look like any of these records could conflict?

 

[ChrisAC]

Without knowing what the actual domain is is't going to be pretty hard to tell you what the problem is.

If you have two MX records for your domain with different priorities then the MX with the highest priority (lowest number) will be the end delivery point for mail to that domain.

The NDR message that you are getting back is most likely due to your mail server not having a PTR record so the other mail server cannot verify the identity of the connecting server.

Chris.


**********************
Chris Andrew, CCNA, CCSA
chris@iproute.co.uk
**********************

 

[dearingkr]

The proper way to configure DNS is...

A mail.domain_name.com points to 64.80.x.x

MX mail.domain_name.com priority 10

MCSE CCNA CCDA

 

[joepc]

How do create a ptr record?

 

[ChrisAC]

To create a PTR you need access to the reverse zone. So, for example, if you have the domain otherdomain.us you may have an MX record like;

otherdomain.us IN MX 10 mail.otherdomain.us
mail.otherdomain.us IN A 111.222.333.444


For the PTR you would need to add an entry in the 333.222.111.in-addr.arpa zone so that you would have;

444.333.222.111.in-addr.arpa PTR mail.otherdomain.us


Chris.



**********************
Chris Andrew, CCNA, CCSA
chris@iproute.co.uk
**********************

 

[joepc]

Would I do this with my registar or within DNS on my 2003 server? I looked on my registar and I didn't see that option. There I only have the option to create these records A, MX, CNAME, & NS.

 

[ChrisAC]

It's most likely that the reverse zone is delegated to your ISP. Just look up the reverse zone to see who's servers it's delegated to and then ask them to add the record.

Chris.


**********************
Chris Andrew, CCNA, CCSA
chris@iproute.co.uk
**********************