I recently informed a tenant that I was selling our house and that I would be sending her a termination of tenancy notice by registered post. I sent the termination the next day by registered post. I also sent it to her by email and also sent it by email to the RTB. I got back from holidays today and checked the tracking of the letter. It was not delivered as no one was home and she did not pick it up at the post office in the following week. It is now in the process of being returned. The fact I have proof I sent it by post and email is this a valid termination or should I start the process again and hand deliver it?