We are looking to develop an email system that is encrypted, secure and easy to use. The system should have features that are over and above similar email systems like Gmail, outlook, etc.
The system should have such options of pin code sent to the receiver to open the email sent. It must be End to end encryption, Anti SPAM, etc.
Please contact if you have already developed such a system. Moreover, provider details how would you implement security and share your development plan.