Viktor Dukhovni: > On Fri, May 06, 2016 at 12:46:10PM -0500, Mike Schleif wrote: > > > > With the simple filter example the virtual aliases expansion is > > > both before and after the filter. > > > > How can it be "both before and after?" > > By processing the message twice, because the filter injects it back > into the Postfix queue for final delivery (without causing the > filter to run yet again and loop).
The FILTER_README ecample has some ASCII art that illustrates the flow.
Wietse
