RE: How to prevent unauthorized use of my SMTP server?

  • From: "Alex Gonzalez" <AGonzalez@xxxxxxxxxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 8 Aug 2005 13:46:44 -0400

Go to the SMTP virtual server and go under relay and make sure the radio button 
is checked "only these servers may relay".  


From: Nicolas Verhaeghe [mailto:nicolas@xxxxxxxxxxxxxxxxxxx]
Sent: Mon 8/8/2005 1:45 PM
To: [ExchangeList]
Subject: [exchangelist] How to prevent unauthorized use of my SMTP server?

How do I make sure that my SMTP server is not open to the rest of the

It seems that I need to have port 25 opened in my firewall to allow
incoming mail, but when I do that, don't I risk letting outsiders use my
SMTP to send their spam?

How can I monitor this activity and also how can I make sure that no
non-authenticated users use my Exchange server?

Thanks a lot!

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