Re: Email Spoofing

[Jeffery . Gieser]

Brooks,

You should be able to only relay mail to or from a specified list of
domains.  I am not a firewall-1 expert but I suspect that www.phoneboy.com
may have the directions for doing this.  If you want to do this for valid
e-mail addresses instead of just valid domains then you are probably out of
luck since the firewall does not know all of the valid e-mail addresses for
your domain unless you define each e-mail address on the firewall.

Regards,
Jeffery Gieser




                                                                                       
              
                    Brooks Carlson                                                     
              
                    <bcarlson@thedswgrou        To:     "'Firewalls \(E-mail\)"        
              
                    p.com>                      <[EMAIL PROTECTED]>             
              
                    Sent by:                    cc:                                    
              
                    firewalls-owner@List        Subject:     Email Spoofing            
              
                    s.GNAC.NET                                                         
              
                                                                                       
              
                                                                                       
              
                    11/13/2000 11:07 AM                                                
              
                                                                                       
              
                                                                                       
              



I have a question about email spoofing.  I am using Checkpoint Firewall-1
4.0 Build 4031.
I have a rule to accept mail on port 25 (SMTP) to our external mail server
address, which
is then translated to an illegal internal address.

any        email_external           SMTP            accept         long
      gateway


Is there any way to set up the firewall to accept and send only incoming
mail from those employees
that have legitimate email addresses with the company?  I don't want our
email server being
used as spam servers.

Sorry for the newbie question...



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