Re: Error sending mail if MX record is "." example is hotmil.com
- From: "Lau Lei Cheong" <leu_lc@xxxxxxxxxxxx>
- Date: Thu, 16 Feb 2006 12:22:08 +0800
Further by RFC 2782:
Target
The domain name of the target host. There MUST be one or more
address records for this name, the name MUST NOT be an alias (in
the sense of RFC 1034 or RFC 2181). Implementors are urged, but
not required, to return the address record(s) in the Additional
Data section. Unless and until permitted by future standards
action, name compression is not to be used for this field.
-> A Target of "." means that the service is decidedly not
-> available at this domain.
"Lau Lei Cheong" <leu_lc@xxxxxxxxxxxx> ¼¶¼g©ó¶l¥ó·s»D:ulam07qMGHA.524@xxxxxxxxxxxxxxxxxxxxxxx
According to RFC 1183 Section 2.2, "." is a legal value for "This domain
does not receive mails."
...The root domain name (just ".") may be specified for <mbox-dname> to
indicate that no mailbox is available....
<9146fan@xxxxxxxxx>
???????:1140054701.195580.254950@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I have a strange problem. Running Win2k3 domain and all win2k3 servers.
I have an email that is trying to be sent to user@xxxxxxxxxxx (yes that
is misspelled).
My IIS6 SMTP server tries to deliver this to my Domain Controller for
some reason. (they are on different servers.) I don't have SMTP server
on the Domain Controller.
The MX record for "hotmil.com" is set to "." (meaning "root" I believe)
with a Preference of 0.
First off, this domain's MX record is probably incorrect. However, why
would IIS6 SMTP and thus the underlying MS DNS resolve this back to my
domain controller?
Seems like a way that bad guys could cause mail servers loop all over
themselves.
Here is an NSLOOKUP for the "hotmil.com" domain.
server ns45.worldnic.comDefault Server: ns45.worldnic.com
Address: 216.168.228.25
set query=mxServer: ns45.worldnic.com
hotmil.com
Address: 216.168.228.25
(root) nameserver = D.ROOT-SERVERS.NET
(root) nameserver = E.ROOT-SERVERS.NET
(root) nameserver = F.ROOT-SERVERS.NET
(root) nameserver = G.ROOT-SERVERS.NET
(root) nameserver = H.ROOT-SERVERS.NET
(root) nameserver = I.ROOT-SERVERS.NET
(root) nameserver = J.ROOT-SERVERS.NET
(root) nameserver = K.ROOT-SERVERS.NET
(root) nameserver = L.ROOT-SERVERS.NET
(root) nameserver = M.ROOT-SERVERS.NET
(root) nameserver = A.ROOT-SERVERS.NET
(root) nameserver = B.ROOT-SERVERS.NET
(root) nameserver = C.ROOT-SERVERS.NET
.
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- From: Lau Lei Cheong
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