Can a legal notice only be sent through registered post?

No, a legal notice can be sent through various means, including registered post, courier, or hand delivery. The specific method of delivery will depend on the circumstances of the case and the preferences of the sender.
Registered post is the most common way to send a legal notice, as it provides proof of delivery. However, it is not the only way to send a legal notice. If the sender is concerned about the cost of registered post, they can send the legal notice through courier or hand delivery.
If the sender is sending the legal notice to a foreign country, they may need to use a different method of delivery, such as international registered post or DHL.
It is important to note that the method of delivery does not affect the validity of the legal notice. A legal notice is still valid if it is sent through a method other than registered post.