220 the.local.host.name ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000\r
250 OK\r
501 userx: recipient address must contain a domain\r
+503-All RCPT commands were rejected with this error:\r
+503-501 userx: recipient address must contain a domain\r
503 valid RCPT command must precede DATA\r
500 unrecognized command\r
500 unrecognized command\r