I looked on every topic but the answer did not resolve my problem. I don’t understand why, but I just NOT receive the email sent by the contact form.
I checked the email adress, I checked that PHP is enabled on my website host (1and1), I checked my Spams, I checked everything. But I still not received any email from the contact form. I am starting to be desperate.
The only thing is that $sender_domain is empty, I just use an email adress @live.fr (Microsoft). Maybe I should complete it with the SMTP server of @live.fr ? I am not sure to understand what is sender_domain.