To fully protect the contents of your email from origin to destination, you will have to encrypt the message itself using an open-source technology like GPG or through the use of a third-party encryption certificate.
Iji chebe ọdịnaya nke email gị site na mbido gaa ebe ị ga-aga, ị ga-ezipụ ozi ahụ n'onwe ya na iji teknụzụ na-emeghe ka GPG ma ọ bụ site na akwụkwọ ntinye nzuzo nke atọ.