Getting zmailer to run (part of) its queue Right Now?

[Arnt Gulbrandsen <agulbra@lupinella.troll.no>]

I've installed zmailer and am reasonably happy with it.  With a bit
more tuning, I expect I'll be really happy :)

One thing I want to tune is to try to deliver all mail for a certain
domain, all mail which can be routed through a certain host, or simply
all mail right now.  Any of the three would make me slightly happy,
number two would make me really happy.

I think I've heard of a new SMTP command to do some of this, ETRN,
too, but can't find a reference to it now.  Does anyone know what's up
with it?

--Arnt