Local mail listener

[Daniel L. Miller]

Ok - now that I've fixed my idiotic routing errors (don't have two NIC's 
on the same network unless you know what you're doing - which I clearly 
don't!), I can get back to Postfix.

From my prior configuration questions in ages past, I have been trying 
to make most of my changes in master.cf, so each listener will do 
exactly what I want (or to be more correct - exactly what it's TOLD, 
which is not necessarily what I wanted...)

There are two processes I would like to configure, but I'm not sure 
which lines would be applicable.  Which line in the default master.cf 
would apply to the BSD mail command on the local server?  So when I'm 
configuring my Postfix server, and from the command line I type "mail 
someb...@hotmail.com", which listener(s) process this?

The other process would be whatever performs the send operation.  If I 
understand it right, whether I use the command line "mail" command or an 
SMTP client, it will connect to an smtpd listener.  Various Postfix 
internals will munch on the information, and assuming it processed 
correctly a Postfix process will then attempt to send it on the remote 
destination (assuming I'm sending a mail intended for a remote 
destination).  Is that step perform by either the "smtp" or "relay" lines?

What I'm actually trying to do is configure a relayhost.  What I want is 
to setup a Postfix listener for local SMTP connections, which will then 
forward to a relayhost for spam processing (in this case, primarily 
auto-whitelisting).  That relayhost will then send the message back to 
Postfix on another connection, and THAT listener will not have a 
relayhost defined so it should attempt direct delivery to the remote 
host.  I know this is something relatively simple - I just seem to be 
more obtuse than usual.
--
Daniel