defer hosts    = !+relay_from_hosts 
	  senders  = !:
	  !authenticated  = *
	  !hosts   = ${lookup dnsdb{>: defer_never,mxh=$sender_address_domain}}
	  acl      = greylist_acl
	  message  = GreyListed: please try again later
	  delay    = 15s
	  logwrite = :reject: