I'm no DNS genius, but I think I see what the problem is. Here is the entire zone
record for that domain:
$ORIGIN lbsolutions.com.
@ 1D IN SOA dns.wwnet.net. hostmaster.wwnet.net. (
1999080901 ; serial
4H ; refresh
2H ; retry
1w3d ; expiry
1D ) ; minimum
1D IN NS dns.wwnet.net.
1D IN NS dns2.wwnet.net.
1D IN A 209.142.242.133
1D IN MX 5 smtp.logitrak.com.
www 1D IN A 209.142.242.133
@ 1D IN SOA dns.wwnet.net. hostmaster.wwnet.net. (
1999080901 ; serial
4H ; refresh
2H ; retry
1w3d ; expiry
1D ) ; minimum
heh...they didn't block full lookups :-)
Part of the problem is the line with "www". This should be a CNAME...not an A Record.
When I reverse 209.142.242.133, I get this:
133.242.142.209.in-addr.arpa. 1D IN PTR www.lbsolutions.com.
This means that the PTR record that is on dns.wwnet.net is incorrectly configured to
www.lbsolutions.com instead of lbsolutions.com.
Since the zone record is lbsolutions.com and not www.lbsolutions.com, the DNS query
can't find the zone record and figure out the MX
host.
As I said, I'm not a DNS genius, so I could be off-track here, but I'm pretty sure
that's your problem. Correct the PTR record (at
the very least) and change that www A Record to a CNAME and everything should clear
up. If you just fix the PTR record, you should
be OK with leaving the www as an A Record. Sloppy, but OK.
-CT
----- Original Message -----
From: "Dale Miracle" <[EMAIL PROTECTED]>
To: "qmail list" <[EMAIL PROTECTED]>
Sent: Monday, September 04, 2000 12:20 AM
Subject: deferral message 451
> Hello Everyone,
>
> I searched through the archive on this and it seems to be a subject that
> has been beat pretty well so I will get to the point. I know the
> problem is with dns but with who's is a good question and why it is
> sporadic.
>
> I have noticed in my logs that the same virtual domain gets the error
> "Sender_domain_must_resolve" from the same 3 mail servers quite often
> though the mail eventually does go through after as many as 100 retries.
>
> delivery 70: deferral:
>
>Connected_to_204.210.223.23_but_sender_was_rejected./Remote_host_said:_451_<[EMAIL PROTECTED]>..._Sender_domain_must_resolve/
>
> That ip address according to ARIN is Timewarner Cable cable modem
> service
> The other two ip's that is always having this error is:
> 207.180.206.1 which ARIN reports is North Coast Web
> 216.196.0.17 which is my isp's mail server. I host the domains on my
> servers and they only have a reverse.
>
> I have a couple friends on warners cable service and send mail to them
> quite often and never get this error when sending them mail but this
> virtual domain always seems to get the error.
> This virtual domain is setup to use my MX in dns. If I use nslookup on
> the above ip's, my isp can do a look up of lsbsolutions.com with no
> problem. North Coast web can only look up my domain (teoi.net) and one
> other virtual domain on my box but not any other (which are on the same
> box using the same DNS) but it could do reverses on all of my virtual
> domains. Timewarner couldn't even look up names in it's own domain so I
> wrote them off (I am not surprised, but that is a story for another
> day).
>
> Is this my problem or their problem? Some days it is fine and others it
> is not. I hope it is not my isp's because getting in touch with them is
> like getting my dog to balance my check book though they are a good isp
> (little down time and decent backbone connections) you just don't want
> to try to e-mail or call them.
>
> Thanks!
> --
>
> Dale Miracle
> System Administrator
> Teoi Virtual Web Hosting
>
