They're nice-looking, but don't have anything that even remotely resembles rules. All it can do is deny or allow all traffic, on per-application basis. If you want your email client to talk to only your email server but not anywhere else (as a security precaution) you'll have to use built-in Windows firewall facilities to set up such a rule.
Rule management is coming in v2.0 - or so they say - but it's not yet here.
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Outpost Firewall used to be a powerful interactive firewall for Windows, but it's dead those days.
