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- Newsgroups: comp.sys.sgi
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!jvnc.net!primerd.prime.com!nt1l!nt1l!aardvark
- From: aardvark@nt1l.krl.com (Donald Koch)
- Subject: Re: Mail ingenuity
- Message-ID: <1992Sep14.155142@nt1l.krl.com>
- Sender: aardvark@nt1l (Donald Koch)
- Nntp-Posting-Host: nt1l
- Organization: Koch Research Labs
- References: <32560@adm.brl.mil>
- Date: Mon, 14 Sep 1992 19:51:42 GMT
- Lines: 35
-
- In article <32560@adm.brl.mil>, zsd@axe.drea.dnd.ca (Jim Diamond) writes:
- > When I use Mail to send mail to a site "tuns.ca" everything works out
- > OK:
- [...]
- > zsd@tuns.ca... Connecting to edison.adm.tuns.ca (tcp)...
- > 220 edison.adm.tuns.ca -- Server SMTP (PMDF#10424 V3.2)
- [...]
- > Thus someone (sendmail?) was able to find an address for "tuns.ca".
- > But if I try telnet, ftp, or nslookup I get
- >
- > % nslookup tuns.ca
- > Server: arrow.drea.dnd.ca
- > Address: 192.12.62.8
- >
- > *** No address (A) records available for tuns.ca
- [...]
- > So: what black magic does Mail or sendmail (or whomever) use to
- > associate "edison.adm.tuns.ca" with "tuns.ca"? Why can't these other
- > network programs do the same?
-
- The asnwer is hinted at in the error from nslookup: No address(!) records...
- You will also note that sendmail actually connected to edison.adm.tun.ca,
- not to a machine called tuns.ca. Try running nslookup (no args), and feeding
- it:
- set type=mx
- tuns.ca
-
- Sendmail looks for MX (mail exchager) records. This tells the mailer what
- machine to connect to in order to send mail to a given domain. The domain
- need not be directly accessable (e.g., my domain, krl.com, is not connected
- to the internet, but it does have a mail forwarder that is).
-
- --
- Don Koch
- aardvark@nt1l.krl.com
-