Re: CNAME records (was: Re: dynamic DNS within a non-dynamic domain)
On Mon, 09 Mar 1998 20:23:06 CST, Rich Puhek wrote:
> The MX record (Mail eXchange) is on your DNS server. It's what points
> incoming mail for "<username>@foo.bar to the appropriate machine to handle
> the mail. What's worked for me is the following:
>
> mail IN A 10.0.20.1
> IN MX 10 mail
>
> It's probably not quite kosher (also note that these are my internal DNS
> numbers), but it does work. I also have an 'A' record for 'debian' (the
> name of our box, real imaginative) pointing to 10.0.20.1.
Thanks. I get the jist of what's going on here. Further, I see Remco,
who initiated this thread, has a static ip, and perhaps a
semi-permanent net connection, so running his own DNS is perhaps
feasible. I, OTOH, am running a dialup networking connection, and
running my own DNS would not be practical (or so I've been told).
This canonifying of hostnames sounded exactly like what was going on,
so I read RFC-821.2 and this is entirely consistent with what seems to
be happening:
------------------------------------------------------------------------
Once the transmission channel is established, the SMTP-sender sends a
MAIL command indicating the sender of the mail. If the SMTP-receiver
can accept mail it responds with an OK reply. The SMTP-sender then
sends a RCPT command identifying a recipient of the mail. If the
SMTP-receiver can accept mail for that recipient it responds with an
OK reply; if not, it responds with a reply rejecting that recipient
(but not the whole mail transaction).
------------------------------------------------------------------------
However, this led me to wonder how I was able to send mail with bo for
so long without problems. Initially, I thought my configuration must
have changed, but recently I've realized that implementation of the
latest anti-spam MTA features across the 'net roughly coincided with my
hamm upgrade, thus it may not be my configuration that changed -- I'm
not sure.
At least this narrows the problem down to C_NAME lookup at my SMTP
server send-time. Now all I have to figure out is how to alleviate
that.
--
David Stern
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http://weber.u.washington.edu/~kotsya
kotsya@u.washington.edu
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