Notice to leave California

[Alex U.]

I had a question for some of our experts. My tennant sent me an email stating he is leaving in 28 days, our lease says he must give 60 days notice.  I told him fine, I would make every effort to market the property and find a new tenant quickly.  

I sent him a form from the bigger pockets landlording book"Notice to vacate" I want him to sign the form stating when he leaving and a forwarding address.

He is not responding, so my question is does an email constitute a notice to leave?