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<?php
$multiple_to_recipients = array(
    'recipient1@example.com',
    'recipient2@foo.example.com'
);

add_filter( 'wp_mail_content_type', 'set_html_content_type' );

wp_mail( $multiple_to_recipients, 'The subject', '<p>The <em>HTML</em> message</p>' );

// Reset content-type to avoid conflicts -- http://core.trac.wordpress.org/ticket/23578
remove_filter( 'wp_mail_content_type', 'set_html_content_type' );

function set_html_content_type() {

	return 'text/html';
}
?>