What is Outpost?

Outpost is an enterprise SMS messaging platform built on AWS End User Messaging (Pinpoint SMS). It handles the full lifecycle of outbound and inbound SMS - sending, delivery tracking, retries, phone number validation, opt-out management, and cost tracking - with multi-tenant isolation and pre-aggregated analytics.

Outpost is messaging infrastructure, not a user-facing product. It is consumed by downstream services that have their own users, campaigns, and communication concepts. Those services interact with Outpost through a REST API authenticated by API keys.

What Outpost does for you

• Sends SMS with per-message lifecycle tracking and automatic retries
• Processes delivery receipts from carrier networks in real time via AWS SNS/SQS
• Validates phone numbers (carrier, type, SMS capability) before sending
• Manages opt-outs - STOP/START keywords, an API, and a public opt-out page
• Handles two-way SMS for inbound replies and keyword processing
• Isolates tenants with tenant-scoped API keys, stats, and data access
• Pre-aggregates statistics across dimensions (tenant, project, campaign, phone, country) and time windows (hour, day, month, all-time)
• Keeps an immutable audit trail of every message lifecycle change and phone state change
• Delivers webhooks so your systems learn about deliveries and opt-outs as they happen
• Groups messages into communications and campaigns, with deduplication at the communication level

Who uses which part?

Next steps

• New to the system? Start with How Outpost Fits Together to see every component and how they relate.
• Ready to send a message? Follow Getting Started.