Kieran Simkin wrote:
I have an IPFW question that I'm a bit stuck on and
could do with some help. Basically what I'm trying to do is count and
limit the number of e-mails each user on the system is allowed to send.
I've got this working fine within the e-mail server and everything's
dandy, except for the fact that it's easy to bypass the mail server by
making direct SMTP connections to the target hosts.
Yes. Use the firewall to do something like:
ipfw add pass tcp from any to MAILSERVER 25 keep-state
ipfw add pass tcp from MAILSERVER to any 25 keep-state
ipfw add unreach filter-prohib log tcp from any to any 25
(I suppose you could use a deny instead, but getting an actual ICMP error is
probably more useful in this situation....)
--
-Chuck
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