How to understand why contact form 7 does not work?

Question

Email

I can’t set up a contact form through contact form 7. Smtp works fine, the plugin for contact form 7 dropped it to version 4.7, everything is fine on the hosting, I did a dance with a tambourine. What could be the problem?

Form example

ИМЯ
[text* text-163 id:name class:contact placeholder "Введите Имя"]

E-mail
[email* email-859 id:email class:contact placeholder "Введите ваш E-mail"]

Тема
[text text-657 id:subject class:contact placeholder "Тема сообщения"]

[textarea* textarea-809 id:comment id:contact placeholder"Сообщение"]

[submit id:submit "Отправить"]