From: Paul Rogers (paulgrogersyahoo.com)
Date: Wed Dec 12 2007 - 18:21:33 CST

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--- Wietse Venema <wietseporcupine.org> wrote:
> If DNS lookups by hand produce results that don't jive with Postfix,
> then testing the DNS as an unprivileged (*) user may be illustrative.

[(*) 500,500 Also note, this is using diald to on-demand dial-up my
ISP & setup a ppp link. That takes longer than host's timeout, so this
result wasn't the first. I don't think this timeout should be
postfix's
issue though, the message bounces even if the link is already
established, & the bounce message says it found the host (yahoo?) but
just didn't get the expected record, with ignore-mx-timeout_error =
yes). It would be good to set postfix's timeout right, but not too
long, because if diald doesn't see "significant" activity in a while,
it
drops the line. Not entirely a bad thing because ipchains is my only
protection.]

$ host -v -t any yahoo.com
Trying null domain
rcode = 0 (Success), ancount=8
The following answer is not authoritative:
yahoo.com 142115 IN NS ns2.yahoo.com
yahoo.com 142115 IN NS ns1.yahoo.com
yahoo.com 142115 IN NS ns3.yahoo.com
yahoo.com 142115 IN NS ns4.yahoo.com
yahoo.com 142115 IN NS ns5.yahoo.com
yahoo.com 142115 IN NS ns6.yahoo.com
yahoo.com 142115 IN NS ns8.yahoo.com
yahoo.com 587 IN SOA ns1.yahoo.com hostmaster.yahoo-inc.com(
                        2007121206 ;serial (version)
                        3600 ;refresh period
                        300 ;retry refresh this often
                        1814400 ;expiration period
                        600 ;minimum TTL
                        )
For authoritative answers, see:
yahoo.com 142115 IN NS ns2.yahoo.com
yahoo.com 142115 IN NS ns1.yahoo.com
yahoo.com 142115 IN NS ns3.yahoo.com
yahoo.com 142115 IN NS ns4.yahoo.com
yahoo.com 142115 IN NS ns5.yahoo.com
yahoo.com 142115 IN NS ns6.yahoo.com
yahoo.com 142115 IN NS ns8.yahoo.com
Additional information:
ns2.yahoo.com 71555 IN A 68.142.255.16
ns1.yahoo.com 71555 IN A 66.218.71.63
ns3.yahoo.com 71555 IN A 217.12.4.104
ns4.yahoo.com 71555 IN A 68.142.196.63
ns5.yahoo.com 71555 IN A 216.109.116.17
ns6.yahoo.com 78134 IN A 202.43.223.170
ns8.yahoo.com 78134 IN A 202.165.104.22

Paul Rogers
Rogers' Second Law: Everything you do communicates.
paulgrogersyahoo.com
http://www.geocities.com/paulgrogers
(Not responsible for anything after this line.)

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