# ultimate address timeout need_ipv4 # exim -odq a@unknown.ex b@known.ex c@test.ex d@test.ex Test message . **** sleep 3 exim -odi -q **** exim -odi -q **** sleep 4 exim -odi -q **** # Remove so that next message does not arrive before # the time of first failure. sudo rm DIR/spool/db/retry exim -odq -f '<>' b@known.ex test 2 . **** sleep 3 exim -odi -q **** no_message_check