CNAME lookup failed temporarily. (#4.4.3) bounced emails

[keith smith]

Thanks for the feedback.  We are not on any RBLs.  

I'll try what you suggest.



------------------------

Keith Smith

--- On Wed, 11/21/12, JD Austin <jd at twingeckos.com> wrote:

From: JD Austin <jd at twingeckos.com>
Subject: Re: CNAME lookup failed temporarily. (#4.4.3) bounced emails
To: "Main PLUG discussion list" <plug-discuss at lists.phxlinux.org>
Date: Wednesday, November 21, 2012, 4:57 PM

Check that your server is not on any RBL list (real time black hole list).Alternately set up a smart host to send through a provider they don't block (like gmail/google apps for domains).


You can test manually using telnet.First get their mail exchange records:

nslookup -query=MX comcast.com

Server:      x.x.x.xAddress:	y.y.y.y#53




Non-authoritative answer:comcast.com	mail exchanger = 5 mx1.comcast.com.

comcast.com	mail exchanger = 5 mx2.comcast.com.

comcast.com	mail exchanger = 5 mx3.comcast.com.

comcast.com	mail exchanger = 5 mx4.comcast.com.




Authoritative answers can be found from:comcast.com	nameserver = dns101.comcast.net.

comcast.com	nameserver = dns102.comcast.net.

comcast.com	nameserver = dns103.comcast.net.

comcast.com	nameserver = dns104.comcast.net.

comcast.com	nameserver = dns105.comcast.net.

mx1.comcast.com	internet address = 76.96.32.247

mx2.comcast.com	internet address = 76.96.32.252

mx3.comcast.com	internet address = 69.241.43.117

mx4.comcast.com	internet address = 69.241.43.118


telnet 76.96.32.24 25

helo <your server name>


mail from:<user>@<your server name>


rcpt to:<user2>@comcast.com


This is a test email


.




On Wed, Nov 21, 2012 at 4:50 PM, keith smith <klsmith2020 at yahoo.com> wrote:




Hi,



One of the Vhost on a server I run is a
shopping cart.  We have been experiencing bounced emails when sending to Comcast.  We do not have this problem with any other ISP.



These emails are sent directly from the
box, such as the order confirmation email.



The problem started when we upgraded
from CentOS 5.x to CentOS 6.x.  I wonder if anyone else has
experience this problem.



The failure message: 

> Hi.
This is the qmail-send program at [boxes fully qualified domain
name]. 
> I'm afraid I wasn't able to deliver your message to
the following 
addresses. 
> This is a permanent error; I've
given up. Sorry it didn't work out. 
> 
> [customers
email address]: 
> CNAME lookup failed temporarily. (#4.4.3)
I'm not going to try again; 
> this message has been in the
queue too long. 

Only happens when emails are sent to Comcast
directly from the server - order confirmation and shipping
confirmation. 

I've search for a solution and read this can be
corrected by setting the DISABLE_CNAME_LOOKUP in qmail-remote.  Something about a buffer being too small??




Is this true or could it be another
issue? 




Thank you for your feedback!

Keith 




------------------------

Keith Smith
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