Local SMTP Forwarding

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Hi All,

I have a IPTables, NAT gateway, and I want to stop local traffic, except
the mail server, from being able to connect to SMTP outside our network.

For instance, some boob with an infected laptop plugged into our network
and we ended up on the spamhuas list for having infected email going out.

Local network is 192.168.99.0/24 on eth0

Anyone know the iptables command I need to do this?

--
Scott
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