Edit Contact Form 7 mail () function

I use your plugin Contact Form 7 on all my websites and it works properly, but today I have faced with the problem with my hosting provider.

1) php mail () function on hosting works well
2) hosting provider has blocked smtp ports and I can’t setup mail sending via SMTP.
3) in WP php mail function works well (I have checked via WP MAIL SMTP)

Trouble – CF7 not works with php mail ().
I have also checked all issues from this page – link

Of course my forms setuped properly (like in my other websites).

The tips that has my hoster recommended me:
– General – Settings – Email address must be [email protected] and this email must be in sender field in forms (done)
– turn off all smtp plugins (done)
– edit /wp-includes/pluggable.php (also done)
search:

// Set to use PHP's mail()

$phpmailer->IsMail();

replace

// Set to use PHP's mail()

$phpmailer->IsSendmail();

How I can edit CF7 mail functions to be able receive mails from my website vi php mail() ?
Thanks in advance)

The page I need help with: [log in to see the link]