Re: mail not sent outside to smart host

Yes, Wolter.

It is possible to be an ISP related issue. If you follow my suggestions to
clear DNS cache, and nslookup, can you get a correct DNS resolution?

Sincerely,

Bill Peng
MCSE 2000, MCDBA, CCNP, CCDA
Microsoft CSS Online Newsgroup Support

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--------------------
Thread-Topic: mail not sent outside to smart host
thread-index: AcfkrvAM2wvCMI22SuG61B7ezswBnw==
X-WBNR-Posting-Host: 207.46.193.207
From: =?Utf-8?B?V29sdGVyIEthcGVy?= <WolterKaper@xxxxxxxxxxxxxxxxxxxxxxxxx>
References: <2D5B1B6B-A573-42E2-B843-C48245D21DB6@xxxxxxxxxxxxx>
<OJL1Td#4HHA.4712@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: mail not sent outside to smart host
Date: Wed, 22 Aug 2007 04:24:00 -0700
Lines: 80
Message-ID: <C9BC6419-1E67-45D5-B82E-9585D27A120D@xxxxxxxxxxxxx>
MIME-Version: 1.0
Content-Type: text/plain;
charset="Utf-8"
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X-Newsreader: Microsoft CDO for Windows 2000
Content-Class: urn:content-classes:message
Importance: normal
Priority: normal
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.2826
Newsgroups: microsoft.public.windows.server.sbs
Path: TK2MSFTNGHUB02.phx.gbl
Xref: TK2MSFTNGHUB02.phx.gbl microsoft.public.windows.server.sbs:58235
NNTP-Posting-Host: tk2msftsbfm01.phx.gbl 10.40.244.148
X-Tomcat-NG: microsoft.public.windows.server.sbs

They did not block our IP for sure.
Because if they did, then I would not be able to send mail at all.
As it turns out, I can send mail if I use their mailservers IP-address,
but
not if I use their mailservers DNS name.

Is's possible they did other stupid things, like spoiling their DNS.
It's also possible the problem is with us.
Wolter

"Mark McDonald" wrote:

Is there any chance that your ISP has done something? Happened to me it
turned out for some reason they blocked my IP from using their smarthost.


"Wolter Kaper" <WolterKaper@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:2D5B1B6B-A573-42E2-B843-C48245D21DB6@xxxxxxxxxxxxxxxx
Hi,

We have SBS2003 configured using the Internet Connection Wizard.
We receive email using the POP3 connector from our ISP.
We send mail NOT using DNS but to a smart host, "mailrelay.planet.nl",
given
to us by our ISP. This setup worked fine for over a year.

A week ago, some days after installing SP2, mail stopped going out and
senders immediately received this message:
"A configuration error in the e-mail system caused the message to
bounce
between two servers or between two recipients. Contact you
administrator"
<ourdomain.nl #5.3.5>
The same message (error 5.3.5) was also found in the logs under
"MSExchangeTransport".

I found these knowledge base articles: KB326304, KB555418, KB316617

Following KB326304, I checked the "SMTP-Connector for SmallBusiness"
that
was found in "First Organisation (Exchange)". I checked that the right
smart
host was mentioned there, by FQDN, and that the Exchange server was not
referring to itself.

Following KB555418, I checked the address space tab of this same "SMTP
connector for Smallbusiness". The address space should be "*", as
indeed
it
was.
Next I checked the "Default SMTP virtual server", Advanced delivery
tab:
Configure button. No internal or external DNS servers should be
configured
there. Indeed, the list of DNS-servers was empty.

I tried various changes, after each change, restarting the server.
Also, noting all changes and finally carefully restoring the original
state.

Finally, the following change succeeded in solving the problem. BUT it
is
an
ugly solution:
On the "SMTP connector for SmallBusiness Server" I changed the smart
host
FQDN ("mailrelay.planet.nl") into the corresponding ip-address, as
reported
by ping and by nslookup.
This solved it.
However, our ISP frequently changes the active machine, so the
ip-address
is
ever changing. So it's not a good solution.

Why is Exchange suddenly unable to lookup "mailrelay.planet.nl" in DNS?
When I type: nslookup mailrelay.planet.nl
then the DNS-service on the SBS server replies correctly and mentions
the
ip-address that currently works.
(Our DNS has been setup automatically by the SBS2003 installer, I
didn't
make changes to it).

Anybody had any problem like this?
Any suggestions or explanations appreciated!

With best regards,
Wolter Kaper





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