I upgraded to version 16 today.
When I sent an email to my address on the entry page, a successful alert was displayed, but I couldn't receive the email.
How can I fix it?
I just downgraded the server PHP version from 8.0 to 7.4. So the email is sending well.
How can I send the email at PHP version 8.0?
This is most likely due to the PHP 8 mail functionality on your server is not being configured properly. I suggest to contact your hosting tech support regarding this.