Why corrier service ? You can send it through whatsapp also.
If you're wondering whether you can send a legal notice via WhatsApp or email, the answer is yes—under certain conditions.
The traditional means of sending legal notices through registered post or courier is still prevalent, but Indian courts are slowly and gradually accepting WhatsApp and email as communication methods in valid applications as long as there is evidence that such notices have been received and duly read.
For example, in the case between Kross Television India Pvt. Ltd. and Vikhyat Chitra Production, it was confirmed by the Bombay High Court that a valid service via WhatsApp comprising double ticks which implies delivery and seen could prove authentic.
Likewise, it states in CLB v. National Spot Exchange Ltd. that the email notice could as well be taken as valid if evidence proved that it reached the recipient.