New Horizon Experience. This article describes text delivery in the New Horizon Experience, which is available now. As of September 28, 2026, New Horizon is the default starting point on a computer or laptop. Mobile apps already use New Horizon. If you still have the older layout, choose Switch to New Horizon from the banner or your account menu.
Horizon can send assignment alerts as free Email-to-SMS (when your carrier still supports a gateway), as paid Premium SMS for Officials, or as free push notifications through the mobile app. On New Horizon, set your phone numbers under Contact and assignment text options under Notifications on Personal Profile. On the older layout, phones and the Email-to-SMS carrier choice appear on the Phone Numbers and Text Messaging tabs.
Understanding free Email-to-SMS
With free Email-to-SMS, Horizon emails your carrier gateway (your number plus the carrier domain). The carrier converts that email into a text. Delivery depends on the carrier. Major U.S. carriers such as Verizon, AT&T, and T-Mobile have discontinued their free gateways, so that path will not deliver for those carriers.
Email-to-SMS troubleshooting (when your carrier still supports it)
Incorrect phone number or carrier gateway: Confirm your mobile number on Contact (or Phone Numbers on the older layout). On Notifications, confirm the mobile carrier matches your carrier’s Email-to-SMS domain. Ask your carrier if you are unsure.
Carrier limits: Carriers may delay, filter, or throttle Email-to-SMS. Check with your carrier for gateway rules.
Blocked or filtered messages: Ask your carrier whether messages from mailman@horizonwebref.com are blocked or treated as spam.
Delayed delivery: Peak times and network congestion can slow Email-to-SMS. Allow time for delivery and retries.
Undeliverable messages: If you see an undeliverable notice in Reminders on Members Home, read the carrier error and re-check your number and carrier setting.
Unsupported carriers: Horizon cannot add carrier gateways. If your carrier is not listed, use Premium SMS or push instead.
Recommended alternatives when free Email-to-SMS fails
Premium SMS (Officials): Open Personal Profile → Add-on services (or View Premium SMS / Get Premium SMS on Notifications) to send real SMS to your verified mobile number.
On a computer, open the same Add-on services card from Personal Profile.
Push notifications: Install the Horizon WebRef app for Android or iOS, sign in, and allow notifications. Push does not depend on Email-to-SMS gateways.
For quiet hours, carrier lists, and the full Personal Profile walkthrough, see Personal Profile, How do I change the time text messages are sent?, and Which carriers still support free Email-to-SMS text messaging?.