Notice of termination/expired lease

[Yulia Kaygorodtseva]

Hello, my renter's lease is about to expire, according to the rent agreement I must provide the renter with the Written Notice of termination? as the renter has decided to move out once the contract expires, 45 days before the expiration date I need to send him this official notice? is there an official format I can use for that? can I sign and email it? 

what is the procedure here. thank you!!