Question

Reverse DNS

Asked by: timave11

I have a domain on godaddy with website and ftp hosted on a dedicated server from them, then using exchange 2003 at a different IP address. Most mail is going through but I believe I have the reverse DNS incorrect. AOL mail is getting bounced back but most other is going thru.

Say the domain is domain.com at 12.12.12.12. and the exchange server is at 13.13.13.13 how do I set the mx record and the reverse dns in the godaddy control panel?

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Asked On
2008-02-29 at 20:12:35ID23205711
Tags

DNS

,

PTR

,

GoDaddy

,

Exchange

Topics

Email Servers

,

Exchange Email Server

,

Domain Name Service (DNS)

Participating Experts
3
Points
500
Comments
21

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Answers

 

by: neopumpkinPosted on 2008-02-29 at 20:16:01ID: 21019893

timave11,

MX records are configured at the DNS host, in this case it would be godaddy.  Your MX record should point to the public IP of your exchange server, which for conversations sake would be 13.13.13.13 in your scenario.  The RDNS (PTR) record is setup and configured at your ISP.  You will want to give them a call and request that RDNS record be setup, which is based upon your MX record.

Feel free to let me know if you would like more info.  Thanks

Regards,

Jim P.

 

by: kieran_bPosted on 2008-02-29 at 20:26:20ID: 21019933

MX records should never point to an IP address.  Create an A record called mail.yourdomain.com, and point your MX records at that A record.

rDNS has nothing to do with the MX records specifically, but it is best if it is the same (so mail.yourdomain.com)

 

by: neopumpkinPosted on 2008-02-29 at 23:40:18ID: 21020586

not to hijack this post, but i don't see any reason why an MX record shouldnt point to an IP address - i've been doing it this way for years and all has worked just fine for me.  while you can setup the MX record to point to an IP or an A record, either way it's pointing back to the same IP.  so my question to you is why do you feel this way?

correct, the MX record and RDNS records and independent of one another, but the right way to setup RDNS is to set it based upon your MX record - which is what i was originally getting at in my first post.  i stated specifically in that manner, because there is no other correct option - the RDNS record MUST match up to the SMTP banner on your exchange server otherwise you're going to added to RBL's very quickly.  I know this from first hand experience.

 

by: neopumpkinPosted on 2008-02-29 at 23:44:10ID: 21020599

**correction**

correct, the MX record and RDNS records are independent of one another, but the right way to setup RDNS is to set it based upon the SMTP banner of your exchange server, which I also use as my MX record - this is what i was originally getting at in my first post.  so essentially, my RDNS record, my MX record and my SMTP banner on my exchange server all contain the same info.  i stated this specifically in that manner, because there is no other correct option to configure RDNS - the RDNS record MUST match up to the SMTP banner on your exchange server otherwise you're going to added to RBL's very quickly.  I know this from first hand experience.

 

by: Chris-DentPosted on 2008-03-01 at 03:03:23ID: 21021089


> not to hijack this post, but i don't see any reason why an MX record shouldnt
> point to an IP address - i've been doing it this way for years and all has worked
> just fine for me.

Doesn't conform to RFCs. Some, admittedly not many, mail server can't deliver to MX Records pointing to IP Addresses.

Chris

 

by: timave11Posted on 2008-03-01 at 11:24:42ID: 21023055

Ok thanks for the assisttance but the problem isnt that I dont get the theory but more the fact that I have to have this working by Monday and was hoping I could get an exact answer as to what it is I need to do to keep the mails from bouncing to AOL and other ISP's. Maybe someone could jump on crossloop or something and give me a hand? I am getting kind of nervous here. I have never had to deal with exchange before, always POP servers outside hosted so I never got into it or quite frankly much cared!
I appreciate everyones input but not really giving me the answer i need, pretend I am even more of a moron than I really am and word your answer as such would be great!

Thanks

 

by: kieran_bPosted on 2008-03-01 at 11:27:57ID: 21023075

>>the RDNS record MUST match up to the SMTP banner on your exchange server otherwise you're going to added to RBL's very quickly.

I don't want to argue for the fun of it, but that isn't completely true.  The RDNS entry, and the SMTP Greeting must both be LEGAL names - they must both have corresponding A records.  It is an excellent idea to have them the same as each other, but nowhere enforces it.

I could have (and actually do in a few sites) non matching records across the board.  So, let's say my domain is domain.com, I have the following A records; alpha.domain.com, beta.domain.com, gamma.domain.com - they all point to the same IP.  My MX points to alpha, my SMTP Greeting is beta, and my RDNS is gamma.  That will not get you blacklisted - everything is a legal name.

And as Chris said, MX to IP (or CNAME for that matter) is not RFC compliant.  To a CNAME is questionable, that is a contested point for a few people out there - but everyone seems to agree that to an IP is both unnecessary, and wrong.

RFC 1035, which has been updated a stack of times - you can read about it here -> http://www.dns.net/dnsrd/rr.html

 

by: kieran_bPosted on 2008-03-01 at 11:29:29ID: 21023083

Hi timave11,

You want a quick solution that you can put in place right now, no problem - setup an SMTP connector to route all mail to your ISPs smarthost (usually their normal mail server - give us your ISP and we can find it for you)

http://www.amset.info/exchange/smtp-connector.asp will show you how to configure a smarthost correctly.

Kieran

 

by: timave11Posted on 2008-03-01 at 11:32:58ID: 21023102

Website is hosted on Godaddy and ISP i think is sbc dsl

 

by: timave11Posted on 2008-03-01 at 11:37:04ID: 21023129

This is what I have in the total DNS control Panel in Godaddy

A Records:

Host:...... Points to:
mail.domain.com  68.126.27.33
@ 72.167.141.50

CNAMES
www - @
ftp - @

MX:
@ - 68.126.27.33

PTR:

@  - v=spf1 mx ptr ip4:68.126.27.33 ptr:68.126.27.33 ~all

 

by: kieran_bPosted on 2008-03-01 at 11:38:01ID: 21023132

That should be straight forward, the server name should be

smtp.sbcglobal.yahoo.com

And you would need to enable TLS on the connection as well to authenticate.

 

by: kieran_bPosted on 2008-03-01 at 11:38:33ID: 21023136

change your MX record to mail.yourdomain.com

 

by: kieran_bPosted on 2008-03-01 at 11:39:01ID: 21023138

And while you are at it, change your SMTP greeting to the same thing;

http://www.block.net.au/help/smtp-greeting

 

by: timave11Posted on 2008-03-01 at 11:43:45ID: 21023159

any change on the PTR?

 

by: kieran_bPosted on 2008-03-01 at 11:44:48ID: 21023163

Yes, you don't have one :)

If you use a smarthost it wont matter, but it should be mail.domain.com

 

by: timave11Posted on 2008-03-01 at 11:48:06ID: 21023181

ok att is the isp but I need authentication information?

 

by: timave11Posted on 2008-03-01 at 11:54:48ID: 21023212

ok now the A records look like this:

Host = mail.domain.com , points to = 68.126.27.33
Host = @ , Points to = 72.167.141.50

Cname:

Host = mail, points to = mail.domain.com

MX Record:
Host = @ , points to = mail.domain.com

 

by: timave11Posted on 2008-03-01 at 12:02:42ID: 21023245

still bouncing aol mails. this is killin me here

 

by: kieran_bPosted on 2008-03-01 at 12:08:21ID: 21023273

DNS hasn't propogated yet, so that will take time.

You will also need to wait for your ISP to add that PTR record.

Until then, the authentication information you need for the SBC smarthost will be your DSL login information.

20120131-EE-VQP-002

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