From: Keld Jørn Simonsen (kelddkuug.dk)
Date: Sun Jul 12 2009 - 05:07:08 CDT

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On Sun, Jul 12, 2009 at 11:55:36AM +0200, Ole Tange wrote:
> 2009/7/12 Keld Jørn Simonsen <kelddkuug.dk>:
>
> > from the /var/log/mail/info file:
> >
> > Jul 12 09:12:48 rap postfix/smtpd[6597]: NOQUEUE: reject: RCPT from unknown[92.45.179.70]: 450 4.7.1 Client host rejected: cannot find your reverse hostname , [92.45.179.70]; from=<eononagenarianajsquare.com> to=<keldrap.rap.dk> proto=ESMTP helo=<asy70.asy179.tellcom.com.tr>
> >
> > I then used:
> > host 92.45.179.70
> >
> > Which gave:
> >
> > 70.179.45.92.in-addr.arpa domain name pointer asy70.asy179.tellcom.com.tr
> >
> > And this means that there is a PTR RR.
> >
> > Can it be something about postfix not set up to do reverse name lookups?
>
> Notice how you get a 4xx error code. It may simply be your nameserver
> did not get an answer quickly enough.

you mean by debugging via tcpdump or the like?
>
> If you see no reverse lookups succeeding at all, then it may be your
> resolv.conf that does something weird.

The host command was done on the same machine. and responses seem fast
enough. Anyway asy70.asy179.tellcom.com.tr is a NXdomain. So maybe
postfix tries to look up the name it got from the PTR.

best regards
keld

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