Hello
I read that you solved the problem.
I instead installed WP Mail SMTP because the emails generated by the reservetion area do not reach the recipient. But this plugin immediately interrupted the operation of CF7 which instead already worked well. It does not allow me to send the form and it generates the error. The error is true is not false negative like in your case. Did you have similar problems? am I wrong about configuring WP Mail SMTP?
thanks
