--- /dev/null
+220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000\r
+250-myhost.test.ex Hello CALLER at x.y.z\r
+250-SIZE 52428800\r
+250-PIPELINING\r
+250-AUTH PLAIN\r
+250 HELP\r
+504 rhubarb authentication mechanism not supported\r
+504 rhubarb authentication mechanism not supported\r
+504 rhubarb authentication mechanism not supported\r
+504 rhubarb authentication mechanism not supported\r
+554 Too many nonmail commands\r