Here you determine if and how the device encrypts the connection. The available values have the following meanings:
- No: No encryption. The device ignores any STARTTLS responses from the server.
- Yes: The device uses SMTPS, and is therefore encrypted right from connection establishment.
- Preferred: Connection establishment is not encrypted. If the SMTP server offers STARTTLS, the device starts encrypting. This setting is the default value.
- Required: Connection establishment is not encrypted. If the SMTP server does not offer STARTTLS, the device does not transmits any data.
- Telnet path:
- Possible values:
- No
- Yes
- Preferred
- Required
- Default:
- Preferred