Firewall and SMTP

I need to secure my network. I would like to prevent SMTP from leaving my network unless it comes from one specified server( email server). This should prevent my network from becoming a zombie of spams. How to I go about this? Will protocol binding do ? How do I test if it works?


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OK, that is normally a pretty easy task.

create the following ruleset for your packet filter (whatever device that is):

from to service/port protocol action

------------------------------------------------------------------- email_server any smtp 25 tcp allow LAN any smtp 25 tcp log + deny

Packet filtering will do.

try connecting to external SMTP Servers from the workstation, look what happens and watch the logfile.


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