NDR: Reverse DNS entry

NDR: Reverse DNS entry

Post by jwar » Wed, 05 May 2004 01:20:32


Hi, Getting an NDR: The server sending your mail does not
have a reverse DNS entry. Connection rejected. I cannot
ping the recipients mail server either. I wanted to
manually add a PTR in the reverse lookup zone. Any ideas?

Thanks for your time.
 
 
 

1. Solution found for excessive NDR (Reverse NDR Attack).

2. no reverse DNS entry; some mail servers may not accept your mail

Couple of users have experienced NDR (non-delivery reports) to a couple of
domains.
I suspected it was down to us been listed in a spam blocklist, after doing a
spam database lookup at http://www.yqcomputer.com/ i found the very first
record shows the public IP address of our exchange server - "PTR -
MISSING -- abc.xxx.yyy.zzz has no reverse DNS entry; some mail servers may
not accept your mail"

Here's a snip of a NDR to one of the addresses:

The following recipient(s) could not be reached:

XXXX@XXXXX.COM on 29/10/2004 14:00
The destination system is currently not accepting any messages.
Please retry at a later time. If that fails, contact your system
administrator.
< mailsweeper.LOCAL #5.3.0>

What cause of action should I take to fix the delivery failures, what
options do I have, thx.

3. Outbound emails got rejected due to no reverse DNS entry...

4. How to create Reverse DNS entries for MX records??

5. Public Reverse DNS entries for Multiple domains

6. Reverse DNS entries for MX records

7. Public Reverse DNS entries for Multiple domains

8. How do I fix the Reverse DNS entry(ies)?

9. double entry in DNS reverse lookup zone

10. How to change the reverse dns entry in TATA

11. question about reverse dns entry and forward lookup on HELO name

12. reverse dns entry

13. How to update reverse DNS entries after changing lan address

14. duplicate entries for reverse DNS zone

15. How to configure Reverse DNS entries for MX records