On Sun, 27 Sep 2009, Erick Calder wrote: > On Sep 27, 2009, at 1:03 PM, LuKreme wrote: > > >No, not generally. Unknown users are REJECTed, not bounced. > > ok, I'm not getting this. your statements of 12:53AM and of 1:03PM > seem contradictory... if an address doesn't exist, does it get bounced > (as stated on 12:53AM) or rejected (as stated on 1:03PM, in which case > I'm _not_ a backscatter source, and with which Ansgar and mouss seem > to agree)?
You're getting lost in the semantics. Bottom line: unless you break it, Postfix sends the SMTP client a 550 when an invalid/unknown recipient is specified in RCPT TO. If your virtual aliasing (by way of regex rewriting) breaks recipient validation, *then* you are likely to backscatter. -- Sahil Tandon <sa...@tandon.net>
