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Email encryption refers to the encryption of emails as a security measure to protect the content from unauthorized access. There are different protocols for email encryption such as PGP, S/MIME, TLS, identity-based encryption, and mail sessions encryption. These email encryption products are available either as software or as an appliance, such as a gateway device. In a policy-driven email encryption model, the outbound email can be encrypted based on the keywords contained in the email. With the increasing popularity of cloud-based email encryption solutions, vendors are now offering cloud-based and software-as-a-service-based email encryption solutions.