[SOLVED] plugin not sending new user email

This may not be an Atahualpa issue. But I'm not getting any help at the plugin, maybe someone here has some suggestions.

The plugin is s2Members. It is awesome and complex in signing up members in various categories at various prices and then registering them.

But there is one problem - the final step after

1) the new member has paid at PayPal,
2) the new member gets a receipt from PayPal
3) is sent back to the site to fill out a profile
4) completes the profile and submits it
5) the new member profile shows up in the list of users

The final missing step is that, after submitting the profile, the user is supposed to get an email containing a user name and password generated from the system. But that is not happening.