1. Gmail
2. Yahoo! Mail
3. Zoho Mail - https://www.zoho.com/mail/ - One email account for one Mobile Number
4. Outlook.com
5. tutanota.com - https://tutanota.com/ - Does Not require Phone number to create mail id
6. fastmail - https://www.fastmail.com/ - Required Phone Number - only 30 day free trail
7. yandex - https://mail.yandex.com - Phone Number is not mandatory