On 10/11/2011 11:18 AM, Rich Shepard wrote: > I re-installed bind and both host and dig are now working, but > attempts to > join a mail list fail: > > Oct 11 08:31:44 salmo postfix/smtpd[30881]: NOQUEUE: reject: RCPT from > unknown[67.23.35.254]: 450 4.7.1 Client host rejected: cannot find your > hostname, [67.23.35.254]; from=<dabo-users-boun...@leafe.com> > to=<rshep...@appl-ecosys.com> proto=ESMTP helo=<marge.leafe.com>
This messages was rejected by the reject_unknown_client_hostname restriction. http://www.postfix.org/postconf.5.html#reject_unknown_client_hostname > > Yet, > > [rshepard@salmo ~]$ host 67.23.35.254 > 254.35.23.67.in-addr.arpa domain name pointer > 67-23-35-254.static.slicehost.net. > That's only half of it. You also need to check: $ host 67-23-35-254.static.slicehost.net. Host 67-23-35-254.static.slicehost.net. not found: 3(NXDOMAIN) *that* is why the host is labeled unknown, and was rejected by your rules. > and > > [rshepard@salmo ~]$ host leafe.com > leafe.com has address 67.23.35.254 > leafe.com mail is handled by 10 leafe.com. Unrelated. > > I'm running postfix-2.8.5 on Slackware-13.1/32-bit. > > Your advice and suggestions on resolving this issue will be much > appreciated. > > Rich The usual suggestion is to not use reject_unknown_client_hostname; that restriction will reject a lot from legit but misconfigured clients. Worse, the client IP hostname is under the control of the ISP, and few "consumer" ISPs offer customer control of the IP hostname. So the person on the other end may not be able to fix this misconfiguration. -- Noel Jones
