Date: Sun, 16 Mar 2003 22:48:26 -0600 From: Len Conrad <LConrad@Go2France.com> To: freebsd-questions@freebsd.org Subject: Re: Sending mail to this list Message-ID: <5.2.0.9.0.20030316223609.02afc1e8@mail.go2france.com> In-Reply-To: <1047875517.3e754fbd6e85e@ra.dweebsoft.com>
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> > Mar 16 22:10:32 rackspace postfix/smtp[28417]: 8B00131673: > > to=<questions@freebsd.org>, relay=mx1.freebsd.org[216.136.204.125], > > delay=11, status=deferred (host mx1.freebsd.org[216.136.204.125] said: > > 450 Client host rejected: cannot find your hostname, [65.61.155.146] > > (in reply to RCPT TO command)) "cannot find your hostname" is a postfix msg specific to failure of the ip sending as sender@sender.domain to have matching A + PTR records. the FreeBSD MX must have lookup table where, assuming Paul was sending as plathrop@mqtweb.com when he was rejected, that contains a list "frequently forged domains and/or domains known to have matching A + PTR records": mqtweb.com reject_unknown_client For such domains, Postfix takes the ip of the sending MTA, queries for its PTR hostname, and then queries for the A record of the hostname, which must have the same ip: C.D.B.A.in-addr.arpa. PTR some.host.name. some.host.name. A A.B.C.D Since 65.61.155.146 has no PTR hostname, the PTR + A match fails, and msg rejected. >I believe your mail is being rejected by the freebsd.org server due to >'65.61.155.146' not having a reverse pointer. that's sufficient to get rejected (no PTR will never be able to match an A record), but having a PTR is not sufficient to get accepted btw, the actual domain of some.host.name can be anything. i.e., it does not need to be "label.mqtweb.com" Len To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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