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@informatique49,
Surely the emails are being sent but they are not being received.
Install some mail log plugins to check if they are being sent. If they are being sent and it does not arrive, you can ask your hosting provider to improve the mail sending using mail() function in PHP or you can install an SMTP plugin to send emails using a valid SMTP server.
okay,
what is the exact name of the extension ?
There are some of them. You can find it in the repository.