Email providers

Here are 20 email service providers, starting from the popular ones to the less well-known ones:

1. Gmail (Google)
2. Yahoo Mail
3. Outlook.com (Microsoft)
4. iCloud Mail (Apple)
5. AOL Mail
6. Zoho Mail
7. ProtonMail
8. GMX Mail
9. Yandex.Mail
10. Mail.com
11. FastMail
12. Hushmail
13. Tutanota
14. Runbox
15. Lycos Mail
16. Mailfence
17. Rediffmail
18. Inbox.com
19. YOPmail
20. Guerrilla Mail

Please note that popularity may vary depending on geographical regions and user preferences.