No mail is sent from the theme

Hello,
From the registration and login module to reset the password, emails are not sent

If I register with the default wordpress module the emails for account activation are sent, but if I go through the theme module the emails do not go

Normally Easy WP SMTP should do the job but do not load emails from the theme module (I also tested with Mail Bank)

I reactivated my old theme to test and the emails are leaving from the old theme

I tested disabled all plugins but still the same problem

For info the PHP mail function does not work on my server (VPS Plesk).

You have to go through stmp

The email test with Easy WP SMTP is ok, it sends the email

I do not know what to do…

Thank you