In legal settings, it is required that the notice be handed over to the concerned parties for the court proceedings to happen. However, physical handing over is not always possible. At times, the recipient may not be at the given location. However, the confirmation of 'service' and the date of services (your case) are required so that appeal due date, for example, can be determined. In your case, I would go with the following translation:
तपाईंलाई सूचना हुलाकबाट पठाइएको हो भने पत्र पठाइएको मितिलाई सूचना हस्तान्तरण गरिएको मितिको रूपमा लिइने छ ।
You can however change हस्तान्तरण गरिएको to दिइएको for better readability. Hope this helps.