smtp-user-enum #
verify that user exists on system with higher delay to make sure we get all responses
smtp-user-enum -M VRFY -U user-file -t target-ip -m 60 -w 20
verify that user exists on system with higher delay to make sure we get all responses
smtp-user-enum -M VRFY -U user-file -t target-ip -m 60 -w 20