Mail being rejected to us.

For some reason one of our clients is being blocked by our server. "houserwalker.com" Our domain is parrishconstruction.com. I have recently moved out MX record to a new domain getting rid of a 3rd party and using Exchange. I thought that this problem maybe a cashe issue on there end however they have rebooted their server and cleared the cash. Now they are sending through a third party themselves. What can I do on my end to allow their mail through?
criceparrishAsked:
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jar3817Commented:
What is in the non-delivery report they get back? At the bottom of the NDR it'll say the exact reason the mail was rejected.

How is your exchange server setup? What (if any) antispam/antivirus software is on it? I just ran a diagnostic on your mail server and it took 5 seconds to reject the open relay test. You're not an open relay, but it shouldn't take that long. Do you have any DNS blacklists setup on that server? If so, are they all active? If you setup a blacklist that doesn't exist anymore it can cause timeouts with mail delivery.
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criceparrishAuthor Commented:
I am not sure how to check on the DNS blacklists? Is it possible that it could be being caused and the router (sonic wall router)?
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jar3817Commented:
It could be anything, you really need to post the NDR so we can narrow it down.
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criceparrishAuthor Commented:
The sender is using just an smtp and pop connector in outlook. Their IP address is 205.178.146.50 but their mx points to 64.26.60.153.

Subject: Undelivered Mail Returned to Sender

This is the mail system at host smtpauth00.csee.onr.siteprotect.com.

I'm sorry to have to inform you that your message could not be delivered to
one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own
text from the attached returned message.

                  The mail system

<dsmith@parrishconstruction.com>: host
   remote.parrishconstruction.com[207.144.53.19] said: 550 5.7.1 Sender ID
   (PRA) Domain Does Not Exist (in reply to end of DATA command)

<smurphy@parrishconstruction.com>: host
   remote.parrishconstruction.com[207.144.53.19] said: 550 5.7.1 Sender ID
   (PRA) Domain Does Not Exist (in reply to end of DATA command)



--
David Esterline
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jar3817Commented:
So your server is rejecting them based on SenderID. You could change your SenderID rules to see if that helps. You didn't mention what version of exchange you're using, so I'm assuming 2003.

1. Open the Exchange System Manager
2. Under Global Settings right click and hit properties on Message Delivery.
3. Click on the Sender ID Filtering tab
4. Set the fail action to Accept

This page shows screenshots of it: http://www.msexchange.org/tutorials/Configuring-enabling-Sender-ID-filtering-Exchange-2003-SP2.html

BTW, the IP of your sender (205.178.146.50) is actually blacklisted at backscatter.org, so they might want to take care of that too:  http://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a205.178.146.50
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criceparrishAuthor Commented:
I am using 2007
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criceparrishAuthor Commented:
Thanks for all the help.
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