220 the.local.host.name ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000\r
252 Administrative prohibition\r
599 custom reject\r
+501 unqual: recipient address must contain a domain\r
+501 empty address\r
550 Administrative prohibition\r
221 the.local.host.name closing connection\r