Juerg Reimann: [ Charset UTF-8 unsupported, converting... ] > Hi everybody, > > 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...
http://www.postfix.org/SMTPD_ACCESS_README.html#timing Wietse DELAYED EVALUATION OF SMTP ACCESS RESTRICTION LISTS Early Postfix versions evaluated SMTP access restrictions lists as early as possible. The client restriction list was evaluated before Postfix sent the "220 $myhostname..." greeting banner to the SMTP client, the helo restriction list was evaluated before Postfix replied to the HELO (EHLO) command, the sender restriction list was evaluated before Postfix replied to the MAIL FROM command, and so on. This approach turned out to be difficult to use. Current Postfix versions postpone the evaluation of client, helo and sender restriction lists until the RCPT TO or ETRN command.
