CNAME lookup failed temporarily. (#4.4.3) bounced emails

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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