RE: Subject: Unable to send to some addresses

  • From: Avi Solomon <ASolomon@xxxxxxx>
  • To: "'exchangelist@xxxxxxxxxxxxx'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Thu, 18 Apr 2002 08:28:36 -0400


Regarding this problem, do you, by any chance, have a Firebox Firewall? If
you do, Microsoft has an article about how the Firebox strips ESMTP
information in such a way as to make messages undeliverable. The solution is
to NOT use an SMTP Proxy but instead to use an SMTP Filter. What we did was
use an SMTP Proxy for inbound email and an SMTP Filter for outbound. These
settings are all configured within the firewall itself and you'll need to
contact the Firebox people for more detailed info on EXACTLY how to do it
step-by-step if you're not sure.

Good Luck

- Avi

Subject: Unable to send to some addresses 
From: "may" <may@xxxxxxxxxxx> 
Date: Wed, 17 Apr 2002 07:42:53 -0600 
X-Message-Number: 11 

  We have Windows 2K with Exchange @K + service pack2 installed i am 
facing problem when sending mail to . I receive the 
following message 

      There was a SMTP communication problem with the recipient's email 
server.  Please contact your system administrator. 
            < #5.5.0 smtp;500 Syntax error, command

  in general where can i find detail discription for each error 

  hope any one can guide 


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