More on CNAME problem

[Mark.Andrews at nominum.com]

> In article <200009282312.e8SNCCu20351 at drugs.dv.isc.org>,
>  <Mark.Andrews at nominum.com> wrote:
> >> 10:17:45   Request from 199.117.52.11 for CNAME-record for yellowhead.com.
> >> 10:17:45   Sending reply to 199.117.52.11 about CNAME-record for 
> >> yellowhead.com.:
> >> 10:17:45   -> Answer: There are no CNAME-Records for yellowhead.com.
> >> 10:17:45   -> Authority: SOA-record for yellowhead.com. =
> >> server1.yellowhead.com. (Serial 2000031302)
> 
> >	You have been told that this is a perfectly normal query
> >	trace from a site without a nameserver that supports negative
> >	caching attemting to send email to you.
> 
> Er, why would the remote system(s) be explicitly querying the CNAME?  I
> would have thought the query would be for the MX, not the CNAME, and the
> CNAME (if present) would be processed as part of the request.  Ergo, one
> shouldn't see queries for the CNAME.
> 
> -- don
> 
> 
	Because MTA's are dumb in this respect.  Sendmail in particular.

	Mark
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at nominum.com