Mail1Click - Secure Webmail for Chrome
More About Mail1Click - Secure Webmail
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 the your Android smart-phone 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.