ما هي المدة التي يجب أن يتم فيها تقديم إشعار الإخلاء للاستخدام الشخصي للعقار؟

Sorry but it is not clear to me your advice.

My first question was:

1. Is a registered email service (offered by Emirates Post and triggers a digital certificate time stamped, with the recipients data and content of the email) an acceptable form of registered mail?

According to Emirates Post, it is legal and in the past, Dubai courts have accepted as a proof of evidence.

2. If I want to use for my own a property that I purchased and is already rented, do I need to wait for the tenancy contract first to expire and then only send a notice of eviction?

My understanding of the law was that I have the right to raise the notice of eviction at any time.

Dear Questioner, its okay. I understand, please note the following:

Regarding your first question, yes its acceptable.

Regarding the second question, no you have to send 12 months PRIOR to the expiry date of the contract, otherwise, you cannot evict the tenant for any reason whatsoever unless its breach from his end.