Mailing List

Hello there
I am working with Drupal 6.x and I need to make work a Mailing List Module.
I installed the ezmlm but it simply doesn't send the confirmation email to join the mailing list and all seems OK but I can not make it work. Do I need to install anything else?

I have installed also Mailman Manager and User Mailman Register but it doesn't work.
Do I need to install extra modules to make them work? Do you know any other Mailing List module for Drupal 6.x?

Thanks