Security Researcher Andreas Kurtz made an interesting discovery, Apple has silently removed from the official release, in the last updates, the email attachment encryption from data protection mechanisms. The expert used for its test the iOS forensics tool iPhone Data Protection which allowed him to deepen the analysis. The researcher discovered that at least version 7.0.4 and current. version.1 dont support anymore encryption for email. attachments for. email messages attachments, which are stored in clear text on the iOS devices, this is very risky for user privacy.”]
Source: https://securityaffairs.co/wordpress/24569/security/apple-data-protection-email.html