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Cannot recieve email from one domain, cannot understand why....! How can I see where the message is getting lost..?

Posted on 2004-03-23
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Last Modified: 2010-03-05
Is there any way to see where an email is getting lost in the soup...?  We are getting and recieving email from everybody else in the world except for one domain.  I can send to them but we cannot recieve from them.  I have no restrictions or policies in place on the exchange server or firewalls.  It just stopped working.  They of course are blaming us.  Is there any way to exonerate my equipment .... please help......Thanks very much..
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Question by:mcguire_group
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infotrader earned 500 total points
ID: 10660095
Have them send you an email and look at the C:\WINDOWS\system32\LogFiles\SMTPSVC1 folder.  Check the latest file and open it.  See if you see any connections being made from their server to yours.

I agree with you, though.  Most of the time, it is their fault.  There aren't too many scenarios that this could happen without making any restrictions on your server.  Which version of Exchange are you running?  The only other explanation would be that you are running Exchange 2003, and turned on Blocklist filtering... but even that, they should be getting emails replying that they have been blocklisted.  There is also a filter built into the domain, but that requires you to put the IP or domain name into the filter.

Lastly, I know they say it's not their fault, but have them try to do a "NSLOOKUP -TYPE=MX <YOURDOMAIN.COM>" and see what it turns out.  Sometimes I've noticed that:

1.  The other company might have the DNS hard-coded into their DNS server with the wrong information/IP.
2.  If you have multiple MX records with different priorities setup, some email servers cannot go past the primary MX record.  So for example, if you have mail.company.com with mx priority 5, and mail2.company.com with mx priortiy 10, sometimes they would just keep on trying mail.company.com regardless of whether or not it is good or a valid address.

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by:mcguire_group
ID: 10706698
This was very good advice, I wish I could actually post the resolution to my dillemma.  The problem cleared itself up the following day, I recieved no feedback from the company in question that I could not recieve mail from as to the cause of the situation.  But I followed the advice given to me in the accepted answer and determined that my end was functioning 100%.  Thank you for the timely response, pleasure doing business with Experts exchange.
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