Encrypting attachments offers you better privacy and security.
By default, only content is encrypted. If you need to protect attachments as well, you can enable attachments encryption in your settings.
To encrypt attachments:
- Go to Settings > Security
- Select attachments encryption: Enabled
Note that encrypted attachments cannot be received or insert in the content. It means that when you receive an email with images inside the text, they will appear as external attachments.