You can send an SMS message from an Alpha Sender using Twilio's service, which allows for one-way messaging without requiring a phone number in the recipient's address book. This is useful for notifications, alerts, and verifications. To set up this feature, you need to upgrade your Twilio account, create a Messaging Service, and configure the sender ID. The recommended way to send messages from an Alpha Sender is by setting up a Messaging Service, which can be done in just a minute. Once set up, you can use Java code to send SMS messages using the Twilio helper library. The code requires environment variables for sensitive information, such as account SID and auth token, to be stored securely. With this setup, you can send an SMS message from an Alpha Sender and start exploring other use cases for one-way messaging with Twilio and Java.