Mail1Click - Secure Mail

Mail1Click is a free a secure mail service that uses strong encryption to keep your communications safe.
It uses asymmetric encryption by Rsa keys long 4096 bit sending emails, it signs and encrypts the email automatically.
You can send encrypted message to any normal email address, you can receive encrypted email from any Mail1Click users and you can receive email from any normal email address. All emails with files attached are stored fully encrypted by AES 256. 
You can access your encrypted mailbox using your device or by the web mail interface available at: https://www.mail1click.com

Mail1click is very easy to use, you can activate your account in only one click and it's completely free up to 25 MB of space used. You can increase the usable space  to 10 gigabytes  for a monthly fee of 2.99$, using the in-app purchase option.

The subscription may be managed by the user and auto-renewal may be turned off by  going to the user's Account Settings after purchase. Payment will be charged to your iTunes account at confirmation of purchase. The subscription automatically renews unless auto-renew is turned off at lease 24 hours before the end of the current period.
Your account will be charged for renewal within 24 hours priors the end of the current
period, and identify the cost of the renewal. No cancellation of the current subscription is allowed during the active subscription period.

Term of use:
https://www.mail1click.com/mail1click_terms_of_use.php

Privacy Policy:
https://www.mail1click.com/mail1click_privacy_policy.php