RE: mail not sent outside to smart host

Hi Bill,
As you see from my rhythm of posting I am a part-time network administrator.

""Bill Peng [MSFT]"" wrote:


Hi Wolter,

Thank you for posting here.

Actually, you're now using a recommended way to configure Smart Host -
using its IP address rather than Domain Name. In doing so, it can avoid
problems caused by DNS.

I am glad to hear!

As you mentioned, your ISP may change the Smart Host's IP address, this can
also cause DNS problems. If you want to change the configuration back to
Domain Name, please purge your SBS local cache for the original domain name:

I like to change the configuration back, because the ISP changes the active
server sometimes (as we saw from our smtp log)

1. Run "IPconfig /flushdns" command to purge DNS cache.
2. Open DNS console in Administrative Tools, right click your Server Name,
and click "Clear Cache".

I did both.

After that, please use nslookup to check whether you're able to resolve the
Domain Name to its correct IP address.

Yes, it resolves correctly (but that was OK already).
Still, the problem is there: Exchange can not send mail to this smart host
if I specify its FQDN in the "smart host" box. While he CAN send mail if I
specify the corresponding IP-address.
So Exchange can NOT do the resolution, while nslookup can.

It remains terribly strange. Any suggestions on this mystery are appreciated!
Wolter

If you're not able to do so, contact
your ISP to make sure that their DNS Server has been replicated.

I hope the above info helps.

Sincerely,

Bill Peng
MCSE 2000, MCDBA, CCNP, CCDA
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Thread-Topic: mail not sent outside to smart host
thread-index: AcfiTmmzjUWk9MSHS1O2yo6nUpu05A==
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From: =?Utf-8?B?V29sdGVyIEthcGVy?= <WolterKaper@xxxxxxxxxxxxxxxxxxxxxxxxx>
Subject: mail not sent outside to smart host
Date: Sun, 19 Aug 2007 03:48:01 -0700
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X-Tomcat-NG: microsoft.public.windows.server.sbs

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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