add post mortem to runner.sh

e2e-tests/runner.sh

@@ -7,6 +7,15 @@ for TEST in ./tests/* ; do
     echo "success"
   else
     echo "failure"
+
+    # post mortem
+    echo "ls -l /var/mail"
+    ls -l /var/mail
+    echo "mailq"
+    mailq
+    echo "host example.com"
+    host example.com
+
     exit 1
   fi
 done