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