What is outbound event delivery?

Outbound event delivery is the part of a SaaS platform responsible for getting product events out to systems that customers control. When something happens inside your product, an order completes, a subscription renews, a job finishes, the originating service emits a canonical event, and the delivery layer is what carries that event to wherever each customer has asked for it.

It is the inverse of ingestion. Ingestion is about accepting data into your platform; outbound delivery is about pushing data out of it, reliably, to destinations you do not own. Those destinations belong to your customers: their webhook endpoints, their cloud storage, their warehouses, their queues. The delivery layer has to treat each one as a first-class, independently-configured target.

Almost every B2B product eventually hears the same request from customers: "send us the events." The first ask is usually a webhook. Then a larger customer wants the same data in their warehouse. Then an enterprise account wants it written to a bucket they own, on their credentials, with an audit trail. Each request looks small until you add up the routing, retries, signing, logging, and per-customer credential handling behind it.

Building this in-house means owning a distributed-systems problem that is not your core product: at-least-once delivery, transient-versus-permanent failure classification, backoff, idempotency, dead-letter handling, and a way for customers to see and replay what happened. Outbound event delivery turns that recurring engineering burden into a configurable capability.

A complete delivery layer does more than fire an HTTP request. It routes each event to the destinations that match it, applies any filtering or lightweight transforms the destination requires, and sends the payload under the right credentials. When a send fails, it classifies the failure, retries transient ones with backoff, and moves exhausted deliveries into a dead-letter queue instead of dropping them silently.

It also has to be observable. Every attempt is recorded: which event, which destination, what the payload looked like after transformation, what the destination returned, and whether it was retried. On top of that record sits replay, the ability to re-run a failed delivery, a time window, or a whole dead-letter queue once the underlying problem is fixed. Credential isolation and tenant scoping run through all of it, so one customer's configuration and failures never touch another's.

Pushrail is an outbound event delivery platform. Your service sends one canonical event to Pushrail's ingest API and gets a fast acknowledgement; Pushrail then handles routing, transformation, delivery, retries, failure classification, dead-letter queuing, and replay off the hot path.

Destinations are configurable rather than hardcoded, webhooks, object storage, data warehouses, message queues, streams, databases, and analytics tools, each with its own auth and delivery semantics. Credentials are stored encrypted and scoped to the customer that owns them, and every delivery attempt is logged so you and your customers can answer "did this event get delivered, and if not, why?"