+exim -Mrm $msg1 $msg2 $msg3
+****
+# Using a router with no non-domain preconditions, first should write a domain-retry record.
+sudo rm DIR/spool/db/retry
+exim -odi rz.a@outside
+****
+dump retry
+# Second will find it - this is visible in debug output
+exim -d-all+route+deliver+retry -odi rz.b@outside
+****
+exim -q
+****