Encryption helps in protecting the privacy of an email message. An encrypted message can be read only by the recipient who has the private key that synchronizes with the public key. Any recipient without the corresponding private key will receive an indecipherable text. Scroll down this page to know how to add encrypt button in Outlook 365.
If the user uses the S/MIME encryption, both the sender and the recipient should have a compatible email application that supports S/MIM. But this option is not available for free webmail users such as Gmail, Yahoo, iCloud, etc.If the user uses the Microsoft 365 Message Encryption, then the user doesn't need to install certificates and can send encrypted messages to any email recipient. The only need is the sender should have Microsoft 365 Message Encryption.
You need to install an encryption certificate for your email service. There are many vendors from where you can purchase the encryption certificate. Once you have installed the certificated, begin the steps to enable the Encrypt button in the Outlook 365.
You have now successfully know how to add encrypt button in Outlook 365.