Why is mail not coming from the Laravel site?

Question

Laravel

If you specify smtp and other settings required for smtp in the .env file in MAIL_DRIVER, then mail comes.
If you specify log in MAIL_DRIVER, then mail appears in \laravel\storage\logsthe form of a .txt file.
But if you specify sendmail, then a message is displayed that the mail has been sent, there is no error in the Network (status 200), but the mail does not come.

I tried using just the mail function, here is the code:

<?php
mail('мой-ящик@gmail.com', 'Текст темы', 'Текст сообщения');

The mail has arrived.

How to make it so that it comes with the sendmail setup? How can I understand why she does not come?