exchange black list??


I got a couple of undeliverables that directs me to this web site which I assume means they have my domain listed as blacklist.

The site I'm directed to is:

The undeliverable is: on 7/7/2005 3:20 PM
            The message cannot be delivered due to a configuration error on the server. Please contact your Administrator.
            < #5.3.0 smtp;553 5.3.0 Message from rejected - see>

I am not running open relay on my exchage 2003 server.

I am reluctant to enter my domain info into this site.

Any Ideas?


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It isn't blocking your domain, but your IP address.
You are on a dynamic IP address range.
If you are on DSL or cable connection then these will be considered to by dynamic even if you have a static IP. In most cases all the ISP does on these types of connections is reserve an IP address for your account. It isn't a genuine static IP, more like a reservation in DHCP.

That IP address is also registered to China Telecom. This means it is flagged as being Chinese and therefore is considered a source of spam. A large number of sites will block all messages from Chine if they don't do business with China.

Finally it is also reported that IP address doesn't have a PTR - aka reverse DNS. If you are on a dynamic IP then this would be the case.

SMTP Connector.


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Donnie4572Author Commented:
Sorry Simon. I gave you bogus ip address. My mail server is

That IP address is listed as an open relay.
It was tested on 27th June.

I am little wary of using the online open relay testers, so I would suggest that you try it for yourself from outside your network.
I have instructions on how to do so on my web site:

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Donnie4572Author Commented:

I have tested using these same instructions but I will test again tonight. I have esafe box which was mentioned in one of the online test.

Thanks for your help

From  Mon Jun 27 08:58:56 2005
Return-Path: <>
Received: from ( [])
      by (8.11.6/8.11.6) with SMTP id j5RCwsT25195
      for <>; Mon, 27 Jun 2005 08:58:54 -0400
Date: Mon, 27 Jun 2005 08:58:54 -0400
Received: from ([IP=]) by eSafe SMTP Relay 1119854418; Mon Jun 27 09:24:16 2005
X-RT-Subject: relaytest:
Message-id: <>
Subject: relaytest:

This is an automated test message for the purpose of finding and
adding open relays to our dnsbl.  If you have any questions, see
Donnie4572Author Commented:

I am having problems connecting via telnet 25 as your directions here

after the ehlo domain it sits there awhile then connection lost.
I also tried helo and same result
This connection is to and a pix515 is my firewall.
Do you think the pix could be blocking this?
I'm using xp pro with lan interface firewall off.

A quick look at that IP address clearly shows the PIX is "protecting" the SMTP port.

Turn off the FIXUP SMTP - aka mailguard and try again.

The other thing that could be causing the problem is antivirus. Most of the modern AV software will block certain ports, and 25 is one of the ports blocked. McAfee Enterprise 8.0 does that as I have been caught by it in the past.

Donnie4572Author Commented:
Thanks, That worked. Do I need the fixup smtp or can I leave it off?

This telnet test......
returned "unable to relay"

Both of these sites think I am an open relay

I have followed your detailed instructions for closing open relay and these sites think I'm open. My problem still exist I am blacklisted at and this is big problem for me. I have about 25 users that are getting NDR like this
 There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <#5.5.0 smtp;554 Service unavailable; Client host [] blocked using; relay tested -- 1121099675>

Thanks for any help.


Donnie4572Author Commented:

This from this site

If you don't have users sending email through your email server with Outlook Express or another POP3 client then you can disable "Allow all users that successfully authenticate to relay regardless of the list above".

I do not use pop3 or outlook express but I do use imap can I disable "Allow all users that successfully authenticate to relay regardless of the list above".

I presume that you were trying this from outside your network?

You can leave fixup SMTP off. It causes nothing but problems.

Short term fix is to use an SMTP Connector to route email for those domains that you have problems with via your ISP.

When you configure your IMAP clients, what do you put in for the outbound server?
Your server or the ISP?

Donnie4572Author Commented:
I have added one of the trouble domains to route through my ISP. Hope that works. I will know shortly.

The IMAP clients use my internal exchange for their incomming and outgoing mail server.
Donnie4572Author Commented:
Yes, I have two circuits to the internet and I went out one and in the other for telnet port 25
If you have IMAP clients using your server for outbound, make sure that they are configured for SMTP authentication.
Then take a look at my web site to secure the authentication process:

Donnie4572Author Commented:
Thanks for all Simon.

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