Plain text in mail | WordPress.org

Hi @chelminski

I hope you are doing well today.

We have a feature request in that matter but there is no ETA when this will be implemented. At the moment you can use this mu-plugin:

<?php

add_action( 'plugins_loaded', function() {
	add_filter( 'forminator_custom_form_mail_admin_message', function( $message, $custom_form, $data, $entry, $instance ) {
		$message = str_ireplace( array( '<br/>', '<br/>', '<br />'), ':fmnl:', nl2br( $message ) );
		$message = str_ireplace( '<li>','* ', $message );
		$message = str_ireplace( '</li>', ':fmnl:', $message );
		$message = str_ireplace( '</b>', ':', $message );
		add_filter( 'wp_mail_content_type', function( $content_type ) {
			return 'text/plain'; // Set the MIME Type as Plain Text (Important)
		});
		add_filter( 'wp_mail', function( $mail ) {
			if ( false === strpos( $mail['message'], ':fmnl' ) ) {
				return $mail; // Skip.
			}
			$mail['message'] = wp_strip_all_tags( $mail['message'], true );
			$mail['message'] = str_ireplace( ':fmnl:', "\n", $mail['message'] );
			return $mail;
		}, 10 );
		return $message;
	}, 10, 5 );
});

To learn more about how to install MU-Plugin to a site, please, check this out: https://wpmudev.com/docs/using-wordpress/installing-wordpress-plugins/#installing-mu-plugins

Kind Regards,
Kris