RE: Problem with email from one sender

  • From: <muqeems@xxxxxxxxxxx>
  • To: <exchangelist@xxxxxxxxxxxxx>
  • Date: Tue, 16 Mar 2004 16:36:14 +0300

Ask the sys admin on that company to try telnetting to the SMTP port of your
Exchange server by the host name, 
First let him check his DNS server for the MX entries of your domain, he can
do that by doing an nslookup. 
Then once he gets the name, tell him to try telnetting to the host name of
the server on port 25. 
For the blacklisting.. it should be from your side that you need to check if
you are blacklisting any domain names, not him.. since he is the one sending
mails to your domain and your server will be checking as to who can send
mails to it. 
From the mail contents it appears to me that you have an ISP server that
accepts and relays mails to your domain for you. Ask them to check it for
you, or they should tell you how they prevent open relay servers from
connecting to your MX server. 


-----Original Message-----
From: Dave Sydenham [mailto:davesydenham@xxxxxxxxxxxxxxxxxx] 
Sent: Tuesday, March 16, 2004 3:24 PM
To: [ExchangeList]
Subject: [exchangelist] Problem with email from one sender

We have a company wishing to send us an email but for some reason their
emails do not get through - they get a bounced back message after a day or
two saying that the server was unreachable. I have checked our Exchange
settings and can find no reason for the messages to be rejected from us.
Our ISP claim the messages are not getting to them so I've asked the
sender to check with their ISP to see if they are getting out. Is there
anyway I can trace where the message is being relayed to/from so I can
find where it gets lost? I suspect there may be some blacklist IP address
or something somewhere blocking this. We can send to them OK and they can
send to everyone else except us.

Any ideas?



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