env-from: "jules@box3.plc.example-is-not-known"@plc.example
env-to: unknown@plc.example
220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000\r
+250 myhost.test.ex Hello CALLER at test [10.0.0.2]\r
250 OK\r
550-Verification failed for <"jules@box3.plc.example-is-not-known"@plc.example>\r
550-Unrouteable mail domain "plc.example"\r