# Message delivery guarantees

Source: https://imqueue.org/blog/topics/delivery/

Articles on message delivery guarantees: guaranteed versus unreliable delivery, what each costs in throughput, and delayed or scheduled delivery.

4 articles tagged `delivery`, newest first.

- [@imqueue vs NATS: a framework and a transport are not the same choice](https://imqueue.org/blog/imqueue-vs-nats/) — 2026-08-03, Andrii Glushko: NATS is a messaging system; @imqueue is an RPC framework that happens to use one. Comparing them means deciding how much of the contract you want to write yourself — and whether your fleet is Node-only. — [markdown](https://imqueue.org/blog/imqueue-vs-nats/index.md)
- [One notification, every replica: the LISTEN/NOTIFY duplicate problem](https://imqueue.org/blog/postgres-notify-duplicate-listeners/) — 2026-07-31, Serhiy Morenko: LISTEN/NOTIFY is a broadcast, not a queue. Scale a Node app to three replicas and the same notification gets handled three times — no error, no warning, three charges on the card. Here's why, and what an inter-process lock actually does about it. — [markdown](https://imqueue.org/blog/postgres-notify-duplicate-listeners/index.md)
- [Delayed and scheduled work without adding a job system](https://imqueue.org/blog/scheduled-work-without-a-job-system/) — 2026-07-25, Mykhailo Stadnyk: "Send that email in 24 hours" usually turns into a second deployment, a second data model, and a job record shadowing a service method you already wrote. Often the message queue you already run can just do it. Here's how deferral works as a parameter, and what it costs. — [markdown](https://imqueue.org/blog/scheduled-work-without-a-job-system/index.md)
- [Guaranteed message delivery: cost and when to use it](https://imqueue.org/blog/guaranteed-message-delivery-cost/) — 2026-07-07, Mykhailo Stadnyk: "Will I lose messages if a worker dies?" is the right question — and the answer is a trade-off, not a yes/no. Here's how guaranteed delivery works, what it costs, and how to choose per workload. — [markdown](https://imqueue.org/blog/guaranteed-message-delivery-cost/index.md)

## Other topics

- [Message queues](https://imqueue.org/blog/topics/queue/) — 13 articles
- [Architecture](https://imqueue.org/blog/topics/architecture/) — 10 articles
- [Comparisons](https://imqueue.org/blog/topics/comparison/) — 9 articles
- [RPC](https://imqueue.org/blog/topics/rpc/) — 9 articles
- [Developer experience](https://imqueue.org/blog/topics/dx/) — 6 articles
- [Patterns](https://imqueue.org/blog/topics/patterns/) — 6 articles
- [Transports](https://imqueue.org/blog/topics/transport/) — 5 articles
- [Type safety](https://imqueue.org/blog/topics/types/) — 5 articles
- [Resilience](https://imqueue.org/blog/topics/resilience/) — 4 articles
- [Typed clients](https://imqueue.org/blog/topics/clients/) — 3 articles
- [Jobs & scheduling](https://imqueue.org/blog/topics/jobs/) — 3 articles

All articles: [https://imqueue.org/blog/](https://imqueue.org/blog/) — [markdown](https://imqueue.org/blog/index.md)