dovecot - Mar 2004 - triggering multiple actions on pop-3 request

I want to trigger fetchmail when a user makes a pop-3 request.  The 
reason for this is so that the messages retrieved by fetchmail can be 
filtered via an anti spam service before depositing them into the inbox.

The way I figure it, since I need to know who the user is and that they 
authenticated in order to make the correct fetchmail call, I need to 
spawn the fetchmail process somewhere between the authentication and the 
pop 3 process.

since I'm currently unfamiliar with code at that level, could I get a 
suggestion as to where to start looking?.

apologies if I haven't explained is clearly enough. I'm still just kind 
of exploring the idea myself to see if it's the right way to approach 
this problem (pop 3 anti spam Gateway).  If it works out right, it may 
even end up as part of a firewall (IPCop) as a way of making anti spam 
trivially easy for the technically challenged.  (I.e. put it in a box, 
said it up right, don't let them touch it)

I know it is also somewhat off topic for the group but since I want to 
modify dovecot (the IMAP server that rescued me from UW), I figured I 
would give it a shot.

thanks in advance,
---eric

> The reason for this is so that the messages 
> retrieved by fetchmail can be filtered via an anti spam 
> service before depositing them into the inbox.
How about just running fetchmail in daemon mode, so it's polling for
messages instead of running on demand? Then you don't need to worry
about any special integration issues.

Julian.