xxx@okdomain
  router = r1, transport = t1
yyy@notokdomain is undeliverable: Unrouteable address
syntax error: malformed address: /mod may not follow zzz@dom
yes@exists.virt.test.ex verified
no@exists.virt.test.ex failed to verify: Unrouteable address
xx@notexists.virt.test.ex failed to verify: Unrouteable address