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Date:      Tue, 18 Mar 2003 05:15:40 +0200
From:      Giorgos Keramidas <keramida@FreeBSD.org>
To:        "Paul D.Lathrop" <pdlathro@chartermi.net>
Cc:        freebsd-questions@FreeBSD.org
Subject:   Re: Sending mail to freebsd-questions
Message-ID:  <20030318031540.GA4820@gothmog.gr>
In-Reply-To: <43610994-582F-11D7-A325-000393BF3DE2@chartermi.net>
References:  <43610994-582F-11D7-A325-000393BF3DE2@chartermi.net>

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On 2003-03-16 23:16, "Paul D.Lathrop" <pdlathro@chartermi.net> wrote:
> I was attempting to send a different question to this list, when I
> ran smack dab into a more pressing problem. When I sent the mail, it
> never reached the list. Further investigation found this message in
> my mail logs:
>
> 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))

The IP address of your server resolves fine now.  It was probably just
a temporary DNS outage.

> What exactly does this mean, and how can I fix it? I don't want my
> mail server to be crippled in this manner.

The FreeBSD.org mail server, in an effort to stop some spammers,
requires that hosts mailing through it have both a forward and reverse
DNS lookup that works (host -> ip address and address -> host).

When your message was received, it failed to resolve your IP address
[65.61.155.146] properly, and rejected the post.

Now it should work fine.  hub.freebsd.org below is the primary MX for
the FreeBSD.org domain:

: keramida@hub[19:10]/home/keramida$ hostname
: hub.freebsd.org
:
: keramida@hub[19:09]/home/keramida$ host 65.61.155.146
: 146.155.61.65.IN-ADDR.ARPA domain name pointer rackspace.mqtweb.com
:
: keramida@hub[19:10]/home/keramida$ host rackspace.mqtweb.com
: rackspace.mqtweb.com is a nickname for mqtweb.com
: mqtweb.com has address 65.61.155.146
: mqtweb.com mail is handled (pri=10) by mail.mqtweb.com

- - Giorgos

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