Hi, I need help to configure this plugin.
I want to use gmail as mail account. I enabled the registration form and have enabled users phpmailer. I use an external web service. I tried to configure this plugin alone but I get the following error:

Registrazione fallita.
PHPMailer non è riuscito a inviare Conferma registrazione. ErrorInfo:The following From address failed: xxxxxxxx@gmail.com : Called Mail() without being connected

Sorry for my english i'm italian

PHPMailer works without problems for me.

Please check the plugin options again or ask your host how to.

You can also try the zenphoto_sendmail plugin.

Hello fretzl thank you for having responded to me, could you give me your configuration? Thank You!

I could but I won't ;-) My configuration will not work for you.
You will have to ask your e-mail provider/host what settings you should use.