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

  • From: "Bruce J. Rose" <brose@xxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 8 Aug 2005 13:43:47 -0400

D0 not allow open relay, there are sites on internet that can test this.
You can test by telnet 25  to your mail serer and try to send mail via
command line commands.


-----Original Message-----
From: Nicolas Verhaeghe [mailto:nicolas@xxxxxxxxxxxxxxxxxxx] 
Sent: Monday, August 08, 2005 1:45 PM
To: [ExchangeList]
Subject: [exchangelist] How to prevent unauthorized use of my SMTP

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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