On 2013-07-11 14:30, Juerg Reimann wrote:
Is there a way to reject a certain sender email address before he gets a 550 5.1.1 <em@i.l>: Recipient address rejected: User unknown? When I add the sender to header_check, he still gets first the User unknown reject when he sends to an unknown user...
See http://www.postfix.org/postconf.5.html#check_sender_access
