How to make secure emailcompatabil with other email system? ?

  To make secure email compatible with other email system as, as we know that secured email is compatible in all ways and also it provides good flexibility. So, emails should prioritize the maximum security and a strong encryption and convenience to use like user friendly apps on all their device.

There are some factors which provides a secure email as:

explanation:

so if you are under a school block you cant but it may also be do to you having to add it to your chrome book like an app like i did or its the wifi you have blocking it