CF7 is giving problems after updating to WP 4.6

I find solution on other forum to wait future update of the plugin :

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I changed the wp_mail() function to mail() and removed $attachments. This is working for my setup with contact-form-7 4.5 and wordpress 4.6. Obviously without attachments.

see /wp-content/plugins/contact-form-7/includes/mail.php (Line 85)

old:
return wp_mail( $recipient, $subject, $body, $headers, $attachments );

new:
return mail( $recipient, $subject, $body, $headers );

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I found the same solution on other thread about changing wp_mail() to mail() and removing $attachments, and it worked for me too.

WordPress 4.6.1 fix this bug

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https://codex.wordpress.org/Version_4.6.1
#37736 – Emails fail on certain server setups

This topic is resolved.