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Subject: reverse DNS
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Elinoy

Posts: 4
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ArGoNuke Recruit
ArGoNuke Recruit
11-24-2008 8:01 PM  

ISSUE -

I'm able to send email to any domains except comcast each time I'm trying to do it, I get the following err message

comcast reverse DNS failure : try again later

I check my MX record and everything is fine there I setup my domain about a week ago.

I will appreciate any idea you might have

Thanks

 
mcorrow
Forum Moderator
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ArGoNuke Lt. JG
ArGoNuke Lt. JG
11-25-2008 4:49 AM  
I am assuming that you have a static IP address? If so, you need to have your ISP (the folks who own the IP address) set up the reverse DNS entry on that IP address. The reverse DNS entry should match the domain name for that IP address.. In other words, if you have created mail.abcabc.com as pointing to that IP address, they should make the reverse DNS entry mail.abcabc.com... That way, when you look up the IP address you get mail.abcabc.com, and when you resolve mail.abcabc.com, it matches that IP address... I assume your MX record points to mail.abcabc.com (in this example)..

Make sense?
Matt
SteveT
Forum Administrator

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ArGoNuke Admiral
ArGoNuke Admiral
11-25-2008 8:52 AM  

Matt,

I believe the Reverse PTR has to only exists, it does not have to match the domain name. For example, ArGoStuff and several other sites I host all use the same IP but the reverse PTR record does not have any of my domain names in it.  At least that has been my experience.

You can see if you have a reverse PTR record by using NSLOOKUP and your IP address.  The bold red below is my IP address.  The bold blue is my reverse PTR record.

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\>nslookup
Default Server:  destiny.tcc.dom
Address:  192.168.1.14

> set type=ptr
> 216.179.41.27
Server:  destiny.tcc.dom
Address:  192.168.1.14

27.41.179.216.in-addr.arpa      name = ip216-179-41-27.cust.bestweb.net
41.179.216.in-addr.arpa nameserver = ns1.bestweb.net
41.179.216.in-addr.arpa nameserver = ns2.bestweb.net
ns1.bestweb.net internet address = 209.94.102.55
ns2.bestweb.net internet address = 209.94.102.57
Top Cat Computing BOINC Team StatsRegards,
Steve Topilnycky
Top Cat Computing
http://www.topcatcomputing.com
mcorrow
Forum Moderator
Posts: 244
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ArGoNuke Lt. JG
ArGoNuke Lt. JG
11-25-2008 9:01 AM  
Steve: Normally, that would be sufficient... I have one client's email server that requires that the reverse PTR be able to be resolved to the same IP address.....(in other words, mail.abcabc.com points to 111.111.111.111 and 111.111.111.111 has a reverse entry of mail.abcabc.com)... It caused us tremendous grief for a bit..

Thanks!
Matt
SteveT
Forum Administrator

Posts: 2595
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ArGoNuke Admiral
ArGoNuke Admiral
11-25-2008 9:32 AM  
Matt,
Interesting.. I have not encountered that.. I will keep that in mind.
Top Cat Computing BOINC Team StatsRegards,
Steve Topilnycky
Top Cat Computing
http://www.topcatcomputing.com
Elinoy

Posts: 4
Online: User is Offline
ArGoNuke Recruit
ArGoNuke Recruit
11-26-2008 12:27 PM  

Thank you for your reply. I run the command steve gave me and this is what I got
nslookup
server: smtu
address: 12.127.16.68 <<< this is my DNS provided by my ISP
When I entered
set type=ptr
my server address
I got the following err message
smtu cant find .......... : server failed
I have another server on dynamic ip address that work fine no problem. What is the different ?
my MX record point to my IP address not to the domain name.
I contact my ISP and explain the issue they told me that it is something in my mx record that is not correct, as i mention above I have another server that running on dynamic ip and I use the same DNS server in the setting so my questing is why the dynamic IP can resolve the connection to mail.comcast.net and the static is not ? Like I say it the only domain I'm unable to send email to I able to receive but I can not send.

Please advice ?

Thank you
Eli

P.s.

I did a check on AOL and I was able to send email to AOL account and complete a successful connection with their server, AOL will not let you email to their accounts if you do not have reverse DNS setup correctly, so I guess my reverse DNS are ok. OR maybe I missing something here ???
SteveT
Forum Administrator

Posts: 2595
Online: User is Offline
ArGoNuke Admiral
ArGoNuke Admiral
12-05-2008 3:04 PM  
Eli,

Remember that the Reverse DNS is not of your Domain Name, but of your IP address.

Maybe if you provide your domiain name I can dig a little bit deeper, at thie point I am at a loss, and working with limited information to troubleshoot this.
Top Cat Computing BOINC Team StatsRegards,
Steve Topilnycky
Top Cat Computing
http://www.topcatcomputing.com
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