Can WordPress be installed in the root directory as opposed to a subfolder?
"Please contact to your hosting provider and ask them to set email settings on your server. Everything is working fine except the reservation form so please contact you hosting service provider to configure you email setting and let me know."
Email on your server needs to be able to get from the forms as it perfectly does in a different hosting server on identical conditions. I'm even using en email created in yahoo smllbsnss with the same domain, a working and active email for the account.