When you send an email message using LuxSci, from either your mobile device or your email program, that message is transmitted securely to LuxSci servers using TLS. Once the message arrives, LuxSci encrypts the message for each of your recipients and then delivers the encrypted message to the recipient’s email servers.   Based on your account preferences, who the recipients are, where their email host is, and settings in your account, the encryption used can take the form of:   SMTP TLS, Secure Message Pick Up (Escrow), PGP, or S/MIME.   The type of encryption used is dynamically determined at send time.