?
Solved

PTR Setting

Posted on 2013-05-09
2
Medium Priority
?
426 Views
Last Modified: 2013-05-26
Current DNS setting: (MX: abc.com) - Broadband Line 1
MX 10: mail1.abc.com
mail1.abc.com = (A Record and PTR) 192.168.0.1
 
Question 1:
We have added new broadband Line 2 for internet connection redundant. Line 2 will pick up the mail server sent out job if Line 1 is down.
For Broadband Line 2, what PTR setting is good for us?  

1. MX 20: mail1.abc.com
mail1.abc.com = (A Record and PTR) 10.10.10.1
OR
2. MX 20: mail2.abc.com
mail2.abc.com = (A Record and PTR) 10.10.10.1

Question 2:
For PTR checking, it is really check "domain name" or "A record"?


Thanks !
0
Comment
Question by:rhinoceros
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 8

Accepted Solution

by:
Dipak earned 1600 total points
ID: 39154391
If you have a PTR record for your IP address, and the target of the PTR record has an "A record" pointing back to that same IP address, mail will not be rejected from your server due to an invalid PTR.

For more information go through below article.

http://forums.serverbeach.com/showthread.php?5469-Setting-up-PTR-s-%28aka-Reverse-DNS%29
0
 
LVL 11

Assisted Solution

by:b_levitt
b_levitt earned 400 total points
ID: 39164612
Unless your ISP is delegating the IP zone to you, you most likely need to request that either your ISP adds the PTR record or ask them to delegate to your dns so that you can do it.

I beleive dipak1383 is correct - the PTR record only needs to exist, it doesn't necessarily need to match anything.  That said, years ago some spam solutions were comparing the helo/ehlo smtp response from a sending server to it's ptr record for it's IP.  However, I believe that was against RFC recommendations.
0

Featured Post

NFR key for Veeam Backup for Microsoft Office 365

Veeam is happy to provide a free NFR license (for 1 year, up to 10 users). This license allows for the non‑production use of Veeam Backup for Microsoft Office 365 in your home lab without any feature limitations.

Question has a verified solution.

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

This article explains how a domain name may be inadvertently appended to all DNS queries. This exhibits as described below. (CODE)And / Or: (CODE) Cause This issue can occur in either of these two scenarios. EITHER 1. A Primary DNS S…
I wrote this article to explain some important DNS concepts that should be known to avoid some typical configuration errors I often see in forums. I assume that what is described here is the typical behavior of Microsoft DNS client. I don't know …
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…
How to fix incompatible JVM issue while installing Eclipse While installing Eclipse in windows, got one error like above and unable to proceed with the installation. This video describes how to successfully install Eclipse. How to solve incompa…
Suggested Courses

770 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