RE: Gateway for Exchange 2003

  • From: "John Tolmachoff \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
  • To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Tue, 6 Sep 2005 09:19:29 -0700

The IIS SMTP service can handle hundreds of thousands of messages per day
depending on hardware, so I doubt that is the cause of the problem. I would
first look at DNS issues, including timeouts and cache problems. 


Next time it happens, try clearing the DNS cache on the DNS servers that
both IIS is using as well as the GFI products.


John T

eServices For You


-----Original Message-----
From: Chris Wall [mailto:Chris.Wall@xxxxxxxxxxxxxxxxxxx] 
Sent: Tuesday, September 06, 2005 6:57 AM
To: [ExchangeList]
Subject: [exchangelist] Gateway for Exchange 2003

Hello all,


   Our Exchange systems forward all mail to a 'Smart Host' that resides in
our DMZ.  The Smart Host is nothing more than a Windows 2003 Server with IIS
SMTP services and GFI Mail Essentials and Mail Security.  


   As far as blocking/preventing SPAM and Virus' mail - it works GREAT.  My
problem is that the SMTP service seems to flake out 2 to 3 times a week here
lately.  The SMTP service is still running and receiving mail from Exchange,
and it receives mail from the internet, but the queues will back up and not
deliver the mail at all.  A reboot of the server will get the server to
process mail again and flush out the queues.  Restarting the services does
nothing to assist and there are no events in any of the logs.


   Can anyone point me to any information that indicates what mail volumes
the standard IIS SMTP mail service can handle?   I want to verify that we
are not overwhelming the service with too much volume.



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