According to an embodiment of the present disclosure, a method by an electronic message server includes determining that an electronic message for delivery to a first user comprises sensitive content. Prior to transmitting the electronic message to a client device associated with the first user, the electronic message server requests at least one device attribute from the client device associated with the first user. The at least one device attribute is received from the client device associated with the user. Based on the at least one device attribute, the electronic message server masks the sensitive content such that the masked sensitive content is unreadable within the electronic message. The electronic message that includes the masked content that is unreadable within the electronic message is transmitted to the client device associated with the first user.