telnet:25 on the right DNS entry ???

[Mathias Koerber]

It's called an MX record. Every SMTP server is supposed to look up
MX records to find where to deliver email for a certain domain.
Most Mail clients (MUAs) don't have this functionality, which is why they
require a fixed SMTP server to take on this task for them.

HTH HAND

$ dig usa.net mx

    ; <<>> DiG 8.1 <<>> usa.net mx
    ;; res options: init recurs defnam dnsrch
    ;; got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3
    ;; QUERY SECTION:
    ;;      usa.net, type = MX, class = IN

    ;; ANSWER SECTION:
    usa.net.                53S IN MX       10 mxpool01.netaddress.usa.net.

(so your guess was even correct, unless mail.usa.net is physically
the same machine).

    ;; AUTHORITY SECTION:
    usa.net.                53S IN NS       dns01.ops.usa.net.
    usa.net.                53S IN NS       dns02.ops.usa.net.

    ;; ADDITIONAL SECTION:
    mxpool01.netaddress.usa.net.  22m15s IN A  204.68.24.19
    dns01.ops.usa.net.      20h42m33s IN A  204.68.24.137
    dns02.ops.usa.net.      9h10s IN A      204.68.24.134

    ;; Total query time: 11 msec
    ;; FROM: venus-flytrap to SERVER: default -- 165.21.83.88
    ;; WHEN: Thu Dec  2 07:14:19 1999
    ;; MSG SIZE  sent: 25  rcvd: 153


-----Original Message-----
From: newsgroups <catto at qwestinternet.net>
Newsgroups: comp.protocols.dns.bind
To: comp-protocols-dns-bind at uunet.uu.net
<comp-protocols-dns-bind at uunet.uu.net>
Date: Thursday, December 02, 1999 12:59 AM
Subject: telnet:25 on the right DNS entry ???


|example: myemail at usa.net
|I tried randomly until I found that to use telnet on the port 25(smtp) the
|right address is NOT usa.net but it is mail.usa.net instead...
|how should a software understand it????
|
|again: it I do telnet usa.net 25 IT WON'T WORK !!!
|I manually guessed mail.usa.net 25 and it's fine but the PC does now
|guess...
|what C/C++ function returns or redirects to the right DNS entry ???
|
|