Topic: CNAME lookup failed temporarily

[pizzaco]

About 5 days ago, we've started experiencing delivery issues with some incoming messages. The senders are getting delivery failures from their providers (Yahoo and Juno for sure, and possibly at least one other domain) that look something like this (dalandcorp.com is our domain; I X'd out the actual user but didn't hide the domain because this could be DNS related):

> Hi. This is the qmail-send program at yahoo.com.
> 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.
>
> <XXXXXXXXXX@dalandcorp.com>:
> CNAME lookup failed temporarily. (#4.4.3) I'm not going to try again;
> this message has been in the queue too long.

From what I can glean from the Internet, this is an issue with the provider because it looks like our DNS settings are correct (and haven't changed in some time). I've contacted Yahoo about but haven't received a resolution yet.

I'm posting here to see if anyone has experience dealing with this sort of issue. If so, you can give me some guidance on how to go about getting this resolved?

Thanks

[cactus]

Are you using RHBL and especially SORBS? If so, please have a look here.

[pizzaco]

Thanks for the suggestion. Are your referring to a Right-Hand List?  Based on my somewhat limited understanding of the server config, I have "regular" RBL enabled but not any "Right-Hand" checking. Here are my settings:

    Bcc=disabled
    BccMode=cc
    BccUser=maillog
    DNSBL=enabled
    LogLevel=6
    MaxScannerSize=25000000
    RBLList=zen.spamhaus.org:whois.rfc-ignorant.org:dnsbl.njabl.org
    RHSBL=disabled
    RequireResolvableFromHost=yes
    SBLList=dsn.rfc-ignorant.org
    TlsBeforeAuth=0
    access=public
    qplogsumm=disabled
    status=enabled

[CharlieBrady]

Are you using RHBL and especially SORBS?

That's not relevant. The problem is a DNS lookup problem, on yahoo.com's server. As pizzaco suspects, it could be a problem with the DNS configuration of the dalandcorp.com domain, although I can't see one. Contacting yahoo support is the correct thing to do.

[CharlieBrady]

Try this:

http://www.checkdns.net/quickcheck.aspx?domain=dalandcorp.com&detailed=1

[pizzaco]

Charlie,
Your test email came through just fine. Thanks.

From the test page link sent: "Master DNS defined by SOA (localhost) was not found among NS records"

This wouldn't be causing any issues, would it?

[CharlieBrady]

From the test page link sent: "Master DNS defined by SOA (localhost) was not found among NS records"

This wouldn't be causing any issues, would it?

I wouldn't think so. But it's something for you, or your DNS provider, to fix.