Hello,
I would suggest switching to PHP 8.2 and contacting your hosting provider for additional etails about the SMTP connection failure, to understand whether this was due to incorrect parameters or other factors. They may also recommend a specific script for optimal compatibility.
I remain available.

Online translation:

Bonjour,
Je vous suggère de passer à PHP 8.2 et de contacter votre hébergeur pour obtenir des détails supplémentaires sur l'échec de la connexion SMTP, afin de comprendre si cela est dû à des paramètres incorrects ou à d'autres facteurs. Ils pourraient également recommander un script spécifique pour une compatibilité optimale.
Je reste disponible.

I switched to PHP 8.2 a per your suggestion. I have the SMTP credentials from my hosting provider but where can I adjust these credentials in Website X5 ? I must modify the PHP mailer script  ? Is there a specific help item in your documentation, I can't find it ? Thank you, regards

Hello Patrick,
you can switch to a different e-mail script in Step 5 - Export ---> Upload to the internet ---> Parameters, in the E-mail tab.
By default PHP mailer is selected, but you can choose SMTP and Authenticated SMTP among other options.

Hi again,

I got you, the PHP test is working from the admin console using PHP mailer, so this thing is settled now but the credentials are my own credentials for my own email.

But how does that work when I send a form from the site which is hosted by my provider ? how do I supply the SMTP credentials ? I can't figure out that part ? I created a info@mydomain shall I use this one ? iWhere is the script and should I make any change on it ? 

thank you for your help. Regards, PLR