Sorry if I sound ignorant, but I have been told numerous things on this.

If I pick Relay for nobody, then the users on our system will have to 
authenticate before they can send emails - by checking the "my outgoing SMTP 
server requires authentication". If they don't authenticate, emails won't be 
sent.

But if someone sends an email to someone on our system, then the email will be 
delivered.
  ----- Original Message ----- 
  From: Michael Graveen 
  To: [email protected] 
  Sent: Thursday, April 05, 2007 4:39 PM
  Subject: re: [IMail Forum] How to set Relay options


  Relay for nobody and relay for addresses are the only options that don't make 
you an open relay.

  Mike


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  Subject: [IMail Forum] How to set Relay options
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  I want to set our IMAIL to only allow emails to or from users/aliases in our 
system. I have it set to Relay for Local Users only. Is this right? We had some 
email rejected because it says we have an open relay. What are the best 
settings to use?

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