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

  • From: "Nicolas Verhaeghe" <nicolas@xxxxxxxxxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 8 Aug 2005 11:18:16 -0700

I cannot find the box you describe.
Instead I have an Access Tab with a Relay button which opens a setup
window which I set to the following:
"Select which computer may relay through this server:
Only the list below
In the list:
Granted: (my domain without the .local extension)
Granted: (my group of IP addresses)
Unchecked "Allow all computers which succesfully authenticate to relay,
regardless of the list above"
Grant or deny relay permissions to specific users or groups:
"Authenticated Users" is allowed to submit permission (only box checked)
Am I alright there? Should I specify my domain as FQDN or only it's
short name without the extension?


From: Alex Gonzalez [mailto:AGonzalez@xxxxxxxxxxxxxxxxxxx] 
Sent: Monday, August 08, 2005 10:47 AM
To: [ExchangeList]
Subject: RE: [exchangelist] How to prevent unauthorized use of my SMTP

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

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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