Comments on: Reverse DNS Manager

By: Matt Rosin

Matt Rosin — Sat, 13 Jun 2009 11:06:43 +0000

I have been having a lot of trouble with sending email from my linode (“Relay access denied”). My impression is that postfix is refusing to send email.

Anyway, I haven’t solved it yet but testing against my gmail account, I found that the reverse dns feature changes the way gmail handles mail.

Without setting the rdns, doing a lookup of my hostname based on the ip would give lix-xxx.members.linode.com. Now it gives my fqdn correctly.

Before: Mail gets sent to Spam folder. After: Mail shows up in Inbox.
However this does not change the headers in the email which still grade me as spf “neutral”, not “pass”:

Received-SPF: neutral (google.com: MYIP is neither permitted nor denied by best guess record for domain of MYEMAILADDR) client-ip=MYIP;
Authentication-Results: mx.google.com; spf=neutral (google.com: MYIP is neither permitted nor denied by best guess record for domain of MYEMAILADDR) smtp.mail=MYEMAILADDR

By: caker

caker — Sat, 23 Apr 2005 23:05:39 +0000

Fixed — it now outputs the IP Address rather than the internal ID that we use …

-Chris

By: OverlordQ

OverlordQ — Sun, 10 Apr 2005 23:13:44 +0000

[quote]Match Found!

Do you want to use thedarkcitadel.com as the reverse DNS entry for 1659?[/quote]

O_o

Clicked yes anyways, then looked up the domain again, then it showed

[quote]Match Found!

Do you want to use thedarkcitadel.com as the reverse DNS entry for 1468?[/quote]

Clicked yes, and now rDNS is setup for both

By: caker

caker — Sun, 10 Apr 2005 05:59:39 +0000

[quote:2f470e681a="OverlordQ"]That’s what I meant, the FQDN has two A records pointing to my box and the manager only picks up on the first one.[/quote]
This should now work. You have the option of choosing which IP you want. Please let me know if that works for you.

Thanks,
-Chris

By: OverlordQ

OverlordQ — Sun, 13 Mar 2005 20:29:48 +0000

[quote:2219e59a46="caker"][quote:2219e59a46="OverlordQ"]I got two IP’s pointing to my box, but the Reverse DNS manager only works for one of them, is there any way to fix this?[/quote]
It does work for multiple IPs. Just make sure that you have one of your FQDN pointing to that IP, and enter the FQDN into the DNS manager — it’ll find that it points to the second IP and ask if you want to set the RDNS to that FQDN.

Make sense? There is one current limitation with the RDNS manager — if you’re trying to use the same FQDN for more than one IP, it will only select the first IP.

-Chris[/quote]

That’s what I meant, the FQDN has two A records pointing to my box and the manager only picks up on the first one.

By: caker

caker — Sun, 06 Mar 2005 22:03:10 +0000

[quote:825a6ce46a="OverlordQ"]I got two IP’s pointing to my box, but the Reverse DNS manager only works for one of them, is there any way to fix this?[/quote]
It does work for multiple IPs. Just make sure that you have one of your FQDN pointing to that IP, and enter the FQDN into the DNS manager — it’ll find that it points to the second IP and ask if you want to set the RDNS to that FQDN.

Make sense? There is one current limitation with the RDNS manager — if you’re trying to use the same FQDN for more than one IP, it will only select the first IP.

-Chris

By: mikegrb

mikegrb — Sun, 06 Mar 2005 21:46:02 +0000

Could you include some more details?

Once you set the domain to forward resolve to the IP address, the tool will do a lookup to determine which IP you want to set reverse dns on.

By: OverlordQ

OverlordQ — Sun, 06 Mar 2005 21:29:48 +0000

I got two IP’s pointing to my box, but the Reverse DNS manager only works for one of them, is there any way to fix this?

By: sednet

sednet — Wed, 02 Mar 2005 11:29:11 +0000

[quote:272469ad34="jsbthree"]It was the answer to a vexing problem I was having. I’m not sure if its a bug in the Hula server but it has to have a reverse DNS in order to send mail. The reason this could be a bug in my opinion is that its not toched upon in the documentation. You’d think it would be mentioned somewhere. I found it by eliminating every other possible variable.[/quote]

I’ve never used or even heard of Hula, but chances are your mailer doesn’t need to have reverse DNS set in order to send mail. It’s likely the other side of your mail sending that is causing you problems. I think most mailers will reject your mail if a lookup of your IP fails. I can’t speak for every MTA but sendmail does this by default.

By: jsbthree

jsbthree — Wed, 02 Mar 2005 04:54:07 +0000

It was the answer to a vexing problem I was having. I’m not sure if its a bug in the Hula server but it has to have a reverse DNS in order to send mail. The reason this could be a bug in my opinion is that its not toched upon in the documentation. You’d think it would be mentioned somewhere. I found it by eliminating every other possible variable.

The only other thing I can reason out is that they didn’t consider a hosting situation in which the reverse DNS was not automatically handeled or the same as the forward.. But that doesnt’ much make sense to me. Anyone know?. Anyone care better question?