telnet:25 on the right DNS entry ???
Edmund
c990077 at hk.china.com
Thu Dec 2 02:43:18 UTC 1999
Oh, no, too technical, if someone understand what's MX, he probably wouldn't
have ask such a question. Please redirect him to http://www.dns.net for DNS
concept first.
Mathias Koerber wrote:
> 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 ???
> |
> |
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