BlueMail uses SSL and STARTTLS enforcing certificate check by default.
BlueMail offers a secure Lock Screen feature, that utilizing passcode or fingerprint security
BlueMail uses the secure OAuth2 authorization protocol wherever possible for providers such as Gmail, Google Suite, Office365, and Yahoo, to access your account with a token only.
Account Backup & Recovery
BlueMail’s Secure Account Backup and Recovery tool can really help you out when your phone gets lost or you simply want to upgrade to another device.