Zeug

[...]
acl_smtp_rcpt = acl_check_rcpt
acl_smtp_data = acl_check_data
[...]

begin acl

acl_check_rcpt:
  warn    set acl_m0 = 0
  accept  hosts = :

  accept  hosts = +auth_relay_hosts
          condition = ${if eq {$interface_port}{587} {yes}{no}}
          endpass
          message = relay not permitted, authentication required
          authenticated = *

  deny    message       = Restricted characters in address
          domains       = +local_domains
          local_parts   = ^[.] : ^.*[@%!/|]