Disable the PHPMailer Code for PMPro

disable_pmpro_send_html.php

/**
 * Disable the custom PHPMailer Code for PMPro.
 * This will sometimes fix issues with broken/scrambled emails.
 * Add this code to a custom plugin. https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 * Notice we run on the wp_mail_content_type hook on priority 15 to make sure
 * we run after PMPro sets up the hook here: https://github.com/strangerstudios/paid-memberships-pro/blob/dev/includes/email.php#L127-L137
 */
function my_disable_pmpro_send_html() {
	remove_action('phpmailer_init', 'pmpro_send_html');
}
add_action( 'wp_mail_content_type', 'my_disable_pmpro_send_html', 15 );
remove_filter( 'retrieve_password_message', 'pmpro_retrieve_password_message', 10, 1 );