Plunk
Open-source unified email platform.
Plunk unifies marketing, transactional, and broadcast email under one self-hostable open-source app. AGPL-3.0 license, EU hosting available. Developer-friendly API.
Judged purely as an API. What the request contract guarantees on retry, how complete the webhook event coverage is, whether suppressions are readable and writable programmatically, and how much the message log retains when something needs debugging in production.
Against high-frequency programmatic sends where a missed delivery is a product failure, Plunk covers webhook coverage, event stream, the suppressions API, batch sending, and SDK breadth, and does not cover idempotency keys. Whether that gap matters depends on how central those are to the build.
- Idempotency keys: No
- Webhooks: Yes
- Event stream: Yes
- Operating since: Not published
- Suppressions API: Yes
- Best published rate per 1,000: Tiers not published in comparable form
- Batch sending: Yes
- SDKs: node, python
- Deliverability: Self-hosted depends on your relay. Hosted plan inherits Plunks reputation.
Self-hosted depends on your relay. Hosted plan inherits Plunks reputation.
Indie devs and EU-data teams who want self-hostable unified email.
- › Unified marketing + transactional
- › Self-hostable
- › Open source
- › Smaller community than Postal
- › No SMTP relay option
Features at a glance
| API | Yes |
| SMTP | No |
| SDKs | node, python |
| Webhooks | Yes |
| Templates | rich |
| React Email | No |
| Batch send | Yes |
| Scheduled send | Yes |
| Suppressions | Yes |
| Multi-tenant | No |
| Inbound parsing | No |
| Event stream | Yes |
| Idempotency keys | No |
| Dedicated IP | No |