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Blocking Bogus Emails at the Firewall

By computer_blues ·
Our spam filter is being flooded with tons of bogus email addresses, that have our domain extension on them. (ex. larry@[ourdomain.com]). These make it through the our Firewall, because the Firewall only checks for our domain on the email extension, and forwards the mail to the spam filter, if our domain is in the email. This prevents mail relaying, but is there anything we can do to block these bogus addresses at the Firewall? (Using CheckPoint Firewall 3.0b.)

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