The integration does not correctly send a customers email address and mobile number to Royal Mail. So customers don't get pre advice and other options to manage their delivery. I find this very odd. The data is in the feed to the carrier partner Intersoft and is sent to Royal Mail but not with the correct notification preferences to trigger anything being sent. At least that's the case for Tracked 24 and 48 services we use anyway. So for Royal Mail deliveries they get one email from us, this has a link to the tracking page but not even the tracking number is in the email. Given sending emails and SMS is free from Royal Mail this is a no brainer to change, allows a customer to manage their delivery and would cut down on queries. This data is used with other carriers so why not the biggest delivery service in the UK?