[WORDPRESS] Contact Form 7. Edit mail data before send

functions.php

<?php
// define the wpcf7_mail_components callback
function filter_wpcf7_mail_components( $components, $number )
{
  /*
  $components = compact( 'subject', 'sender', 'body',
			'recipient', 'additional_headers', 'attachments' );
  */
	// make filter magic happen here...
	$components[ 'subject' ] = 'New subject changed in filter';
	return $components;
};

// add the filter
add_filter( 'wpcf7_mail_components', 'filter_wpcf7_mail_components', 10, 2 );

More details https://docs.wpdebuglog.com/plugin/contact-form-7/5.1.7/filter/wpcf7_mail_components/