How to change email template <body> style

For the changing your email template style or another HTML tag <body> attributes you may to use the next UM Hook "um_email_template_body_attrs". More details  here

This is small example of use this hook. Please insert the following code into your child theme "functions.php" file.

add_filter( 'um_email_template_body_attrs', 'um_custom_email_body_attrs', 10, 3 );

function um_custom_email_body_attrs( $attrs, $slug, $args ) {

        return 'style="background:#fff;"';

}