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Date:      Sat, 11 Apr 2009 07:57:36 +0000
From:      Da Rock <rock_on_the_web@hotmail.com>
To:        <on@cs.ait.ac.th>
Cc:        freebsd-questions@freebsd.org
Subject:   RE: OT: Postfix rejects from Freebsd server
Message-ID:  <BAY143-W250AEC933EEBDB20CF22C68D810@phx.gbl>
In-Reply-To: <200904110742.n3B7gVXa084092@banyan.cs.ait.ac.th>
References:  <BAY143-W8BC1C31B31D918C13F1838D800@phx.gbl> <87ws9szxj0.fsf@kobe.laptop> <BAY143-W21866D8F1A83986791CCA48D810@phx.gbl>  <200904110742.n3B7gVXa084092@banyan.cs.ait.ac.th>

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> Date: Sat=2C 11 Apr 2009 14:42:31 +0700
> From: on@cs.ait.ac.th
> To: rock_on_the_web@hotmail.com
> CC: freebsd-questions@freebsd.org
> Subject: Re: OT: Postfix rejects from Freebsd server
>=20
> > Apr 11 16:26:40 <hostname (internal)> postfix/smtp[1325]:
> > 488851744F: to=3D<freebsd-multimedia-request@freebsd.org>=2C
> > relay=3Dmx1.freebsd.org[69.147.83.52]:25=2C delay=3D100211=2C
> > delays=3D100114/49/48/0.35=2C dsn=3D4.7.1=2C status=3Ddeferred (host
> > mx1.freebsd.org[69.147.83.52] said: 450 4.7.1 Client host rejected:
> > cannot find your hostname=2C [<my-IP>] (in reply to RCPT TO command))
>=20
> It seems like it is a DNS problem.
>=20
> Are you sure that:
>=20
> - your mail server gateway name resolves into your mail server gateway IP
>=20
> and
>=20
> - your mail server gateway IP reverse resolves to your mail server gatewa=
y name
>=20
> Both should be resolve properly.
>=20
> The check should be done outside of your own subnet=2C from an Internet
> Cafe (use Windows nslookup command=2C same syntax as nslookup on Unix)
> from home if you use a different ISP than for the machine that makes
> problem...
>=20
> You mention that you recently changed your IP=2C how recent is that
> recently? The old IP/name could be cached at FreeBSD.
>=20

I thought it sounded like dns too. But I was under the impression that only=
 a reverse lookup was used against the Server name sent by postfix. I have =
specifically requested a ptr record in the arpa zone=2C and I can run a res=
olveip successfully here.

Is my info wrong? Is the lookup done against more than just the Server name=
 set in main.cf?

Cheers

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