Chris Smith wrote:
In addition to preventing infected PC's from using their own SMTP engine to send out spam by blocking port 25 from all but the mail server. I would also like to add those hosts automatically to a table in order to block their access altogether so that the infected PC's cannot attempt other damage. How can this be accomplished?


You can use PF for that.

pass connection from any to your smtp server and block everything else to port 25 with log into a table. You also use that table to block all outgoing connections.

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