On 13.07.2011, at 17:07, Victor Duchovni wrote: > On Wed, Jul 13, 2011 at 04:57:02PM +0200, Geert Mak wrote: > >> is it possible to reject/redirect on postfix level (to a spam catcher >> account we monitor) - >> >> - all mail sent to undisclosed recipients > > Why not focus on spam, rather than weakly correlated factors. It is probably > best to deploy a decent spam filter.
We have Spamassassin. But I thought that this is a simple enough case to be handled directly on Postfix level before even entering Spamassassin. >> - all mail sent with "our" addresses in From: but not originating from >> us (or mail server is in-house, one server with one IP) > > This would be a mistake. For example, you'd never see your own posts to > this list. Oh... I see. > This said, you may find that filtering the envelope sender (rather than > the From: header) is reasonably effective. The main collateral damage is > "forward an article" newspaper sites, ... which send email with envelope > address set to the visitor's alleged address. I see, this seems not an easy one. Thank you! Geert
