Question

Mail Server & Reverse DNS

Asked by: rgilbert

When I send out e-mail from my mail server, the real word receives the address as, for example, 192.168.0.4; however, when you do a reverse DNS on my mail server's address (e.g., 192.168.0.4), the address returned is that of my authoritative DNS server, for example, 192.168.0.9.  In the end, some people reject my e-mails because the reverse DNS does not match that of the sending mail server address… does anyone know anything about this, or have any advice, so that I can eliminate this problem?

Thanks!

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Asked On
2005-07-15 at 07:37:09ID21492964
Tags

dns

,

reverse

Topics

Miscellaneous Networking

,

Domain Name Service (DNS)

Participating Experts
4
Points
250
Comments
12

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Answers

 

by: gpriceeePosted on 2005-07-15 at 08:33:31ID: 14451917

Hi.
You should ask your ISP to add a reverse DNS entry for your mail server to resolve to its address, and everything will be fine.

 

by: rgilbertPosted on 2005-07-15 at 08:45:21ID: 14452080

Our ISP has added reverse DNS for our entire subnet....

 

by: mikeleebrlaPosted on 2005-07-15 at 08:53:27ID: 14452166

192.168.0.4 obviously is a private IP address and not a real world address at all.  I think you are confusing public and private DNS zones.

 

by: rgilbertPosted on 2005-07-15 at 08:56:35ID: 14452202

No 192.168.0.4 is theoretical... only an example.

 

by: gpriceeePosted on 2005-07-15 at 09:00:29ID: 14452247

And you can receive email and have an mx record?
My assumption, then, would be that you are not on a teir one provider using a farctional T-1 or T-1, and AOL might be kicking your mail because of the originating address.

Go to http://postmaster.aol.com/tools/rdns.html and check the results.

 

by: gpriceeePosted on 2005-07-15 at 09:01:32ID: 14452258

 

by: rgilbertPosted on 2005-07-15 at 09:10:10ID: 14452344

We do have 3 T1s and we used to have a problem with AOL; however, once our ISP registered reverse DNS for our IPs, AOL worked fine.  

When I went to the site you have provided, my MX records show the routing to my mail server successfully.  

 

by: mikeleebrlaPosted on 2005-07-15 at 09:13:29ID: 14452376

well from this statement "reverse DNS on my mail server's address (e.g., 192.168.0.4), the address returned is that of my authoritative DNS server" leads me to believe that you have incorrect reverse dns records.  when anyone does a reverse lookup of mail.yourdomain.com they should actually get the public IP address of your mail server, not your public DNS server's IP address.

run a check of your dns records on www.dnsreport.com and see what you get.  If there are errors or warnings contact your ISP since they manage your public DNS and its their job to get it right.

 

by: gpriceeePosted on 2005-07-15 at 09:16:36ID: 14452404

If it was the AOL site that worked, then you might be black listed or are sending bilk mail: http://postmaster.aol.com/tools/whitelist_guides.html

 

by: jdraggiPosted on 2005-07-17 at 21:48:12ID: 14463770

Check your spam status here:

http://www.spamhaus.org/
http://www.spamhaus.org/sbl/index.lasso

You can also check a lot of dns stuff here

http://www.dnsstuff.com/

Hope that helps,
John

 

by: Bill_FleuryPosted on 2006-03-07 at 19:03:53ID: 16129985

No comment has been added to this question in more than 21 days, so it is now classified as abandoned.
I will leave the following recommendation for this question in the Cleanup topic area:
Split - mikeleebrla, gpriceee, and jdraggi

Any objections should be posted here in the next 4 days. After that time, the question will be closed.

Bill_Fleury
EE Cleanup Volunteer

20120131-EE-VQP-002

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