WP Mail SMTP: when using SMTP mailer - disable SSL verify on PHP 5.6+

wpms-smtp-disable-ssl-verify.php

<?php

add_filter('wp_mail_smtp_custom_options', function( $phpmailer ) {
	$phpmailer->SMTPOptions = array(
		'ssl' => array(
			'verify_peer'       => false,
			'verify_peer_name'  => false,
			'allow_self_signed' => true
		)
	);

	return $phpmailer;
} );

Thank you, it works! (using Wordpress 6.0 and WP Mail SMTP Version 3.2.1)

It works, thank you. For those wondering where to put this, the cleanest possible way is to use the Code Snippets plugin:

https://wordpress.org/plugins/code-snippets/