Re: catching fake usernames?

[mouss]

John Andersen wrote:
On Wednesday 30 August 2006 21:25, Benny Pedersen wrote:
  
On Thu, August 31, 2006 05:41, Rick Roe wrote:
    
like there should be a simpler, more automatic way to do this. Am I
missing something?
      
in postfix main.cf
smtpd_reject_unlisted_sender = yes
    

Won't work if ONE of the recipients is real...

  
OP is talking about _sender_ . so Benny's rule works if OP means 
envelope sender (in contrast to From header).