Unforeseen with the form

Greetings to all, I just updated my website, and I am having problems with the form, I made tests with hidden url / html / php export and in no case the form is reaching the mail! Has anyone had this problem? Any idea that could be?

My hosting provider tells me the following:

I see that the script uses the php mail function that is disabled due to security issues.

you are not authorized to transmit \ n550 through this server without authentication.

In this case, you can use the phpmailer https://github.com/PHPMailer/PHPMailer/wiki/Tutorial to track messages using an email account with authentication.

How do you do this from blocsapp, since I always use the same form? I need urgent help with this topic.