cannot find your hostname [xxx.xxx.xxx.xxx]

Hi
I have some issues sending email to some domains...

sending to some domains I receive an "Undeliverable" email from the excahnge server with error: mail.faillingdomain.com #550 Client host rejected: no reverse DNS set. ##

to other domains the email get stuck in the Queue with Last Error desc: "Client host rejected: cannot find your hostname, [xxx.xxx.xxx.xxx]<-- outbound public ip

I called my ISP to set the PTR record to, mail.mydomain.com on outbound public ip address (.18)

my current setup is...
MX record points to a SPAM filtering supplier, then supplier send filtered emails to inbound public ip (.19) to my exchange server ...
outbound emails are going thru (.18)

header email when I send to anothe domain...

Delivered-To: lcastillo@externaldomain.com
Received: by 10.229.236.130 with SMTP id kk2cs203037qcb;
        Tue, 30 Mar 2010 15:30:13 -0700 (PDT)
Received: by 10.114.189.13 with SMTP id m13mr5942858waf.130.1269988213337;
        Tue, 30 Mar 2010 15:30:13 -0700 (PDT)
Return-Path: <lcastillo@mydomain.com>
Received: from mail.mydomain.com ([xxx.xxx.xxx.18])<-- external IP
        by mx.google.com with ESMTP id 33si13518244pzk.73.2010.03.30.15.30.12;
        Tue, 30 Mar 2010 15:30:12 -0700 (PDT)
Received-SPF: neutral (google.com: xxx.xxx.xxx.18 is neither permitted nor denied by best guess record for domain of lcastillo@mydomain.com) client-ip=xxx.xxx.xxx.18;
Authentication-Results: mx.google.com; spf=neutral (google.com: xxx.xxx.xxx.18 is neither permitted nor denied by best guess record for domain of lcastillo@mydomain.com) smtp.mail=lcastillo@mydomain.com
Received: from myexchange.mydomain.mx.mty ([xx.xx.xx.117]) <-- internal ip by
 myexchange.mydomain.mx.mty ([xx.xx.xx.117]) with mapi; Tue, 30 Mar 2010 16:30:40
 -0600
From: "Luis LC. Castillo" <lcastillo@mydomain.com>
To: "lcastillo@externaldomain.com" <lcastillo@externaldomain.com>
Date: Tue, 30 Mar 2010 16:30:38 -0600
Subject: test
Thread-Topic: test
Thread-Index: AQHK0FifB2qAPqJHP0yRfmVj4UPlew==
Message-ID: <4531BABF0478BA4482D1EE73B3F2F14889CB6E8182@mtyexc01.guentner.mx.mty>
Accept-Language: es-ES, en-US
Content-Language: es-MX
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: es-ES, en-US
Content-Type: multipart/alternative;
      boundary="_000_4531BABF0478BA4482D1EE73B3F2F14889CB6E8182mtyexc01guent_"
MIME-Version: 1.0

--_000_4531BABF0478BA4482D1EE73B3F2F14889CB6E8182mtyexc01guent_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable



--_000_4531BABF0478BA4482D1EE73B3F2F14889CB6E8182mtyexc01guent_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<html dir=3D"ltr"><head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style title=3D"owaParaStyle"><!--P {
      MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px
}
--></style>
</head>
<body ocsi=3D"x">
<div dir=3D"ltr"><font color=3D"#000000" size=3D"2" face=3D"Tahoma"></font>=
&nbsp;</div>
</body>
</html>

--_000_4531BABF0478BA4482D1EE73B3F2F14889CB6E8182mtyexc01guent_--






lcastillo83Asked:
Who is Participating?
 
Alan HardistyConnect With a Mentor Co-OwnerCommented:
Please have a read of my article that discusses the problem of not being able to send mail to one or more domains:
http://www.experts-exchange.com/articles/Software/Server_Software/Email_Servers/Problems-sending-mail-to-one-or-more-external-domains.html 
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linrafCommented:
Use mxtoolbox.com to make sure that your request was done.
Make sure that you have an A record for mail.mydomain.com that points back to xxx.xxx.xxx.18 (external ip), some mail servers/ spam filters want that.
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lcastillo83Author Commented:
in mxtoolbox.com is displayed correctly...

PTR xxx.xxx.xxx.18 mail.mydomain.com  TTL= 48 hrs

my A record for mail.mydomain.com points to .19 as it is the OWA url.

Thanks
0
 
linrafCommented:
Ptr info must match a record info. Use a different ptr name specifically for .18 and create an A record for that hostname to point to .19.
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