[Dovecot] trying to enable features

[Ray]

On Saturday 13 October 2007 3:39:20 pm Gerard wrote:
> On Saturday October 13, 2007 at 05:17:56 (PM) Ray wrote:
> > I'm trying to enable 3 different features in my mail system (postfix,
> > amavisd, dovecot).
> >
> > 1)out of office auto reply
> > 2)script execution based on email
> > 3)automatically add disclaimer/signature to outgoing email
> > (also listed in order of importance to me)
> >
> > I'm looking for pointers to documentation or instructions. It seems that
> > 1 and 2 would best be done in dovecot somewhere, while 3 is probably best
> > implemented in postfix. (my next step is postfix documentation)
> >
> > Can anybody provide any suggestions or pointers to a how to or other
> > documentation?
>
> I think you should start seriously reading the Postfix documentation as
> well as subscribe to its mail forum list, since that is where you are going
> to be implementing the above three features, although #2, depending on what
> sort of script you are referring to, might possibly be initialed with
> Dovecot.

Please correct me where I'm wrong.
according to my understanding: When the server receives an email, dovecot pop 
server makes connection with the outside world, accepts the mail and then 
stores it. Postfix doesn't know or care that I have just received an email, 
so how can postfix send an auto reply or pass the mail on to a script?
Thanks,
Ray
p.s., I'm rereading postfix documentation now.