When creating filter exceptions, i'm confused by all the examples I see, so
I thought i'd ask out here.
When you create a filter is there a rule of thumb for which direction the
port gets defined on, for example, when defining a static entry for smtp in,
from public interface to private interface, would I define port 25 on the
destination since that is where the traffic is going to, or on the source
since that is where it is coming from?

If there is a rule of thumb to follow for that it would make life much