Name:Tutanota (Free)
URL:https://www.tutanota.com/
Description:One of the most privacy enriching open source email provider
Utility:This free email providers helps - 

• Create covert accounts
• Protect our privacy

Special Features:

• Automatically encrypt all the data on the device. Even subject, attachment as well as contacts are encrypted. 
• 2FA and Open source 

•    Apps for iOS and Android 
•    Germany strict data protection laws