--- /dev/null
+userx@test.ex cannot be resolved at this time: error in r1 router: no host(s) specified for domain *
+userx@test.ex cannot be resolved at this time: lookup failed for all hosts in r1 router: host_find_failed=ignore host_all_ignored=defer
+userx@test.ex cannot be resolved at this time: lookup failed for all hosts in r1 router: host_find_failed=ignore host_all_ignored=defer
+userx@test.ex
+ router = r1, transport = t1
+ host 127.0.0.1 [127.0.0.1]
+userx@test.ex
+ router = r1, transport = t1
+ host 127.0.0.1 [127.0.0.1]
+ host 127.0.0.2 [127.0.0.2]
+userx@test.ex cannot be resolved at this time: lookup failed for all hosts in r1 router: host_find_failed=ignore host_all_ignored=defer
+userx@test.ex is undeliverable: Unrouteable address
+userx@test.ex is undeliverable: lookup failed for all hosts in r1 router: host_find_failed=ignore host_all_ignored=fail
+userx@test.ex
+ router = r2, transport = t2
+userx@test.ex cannot be resolved at this time: lookup failed for all hosts in r1 router: host_find_failed=ignore host_all_ignored=freeze