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.
Growth work lives or dies on targeting and measurement. What matters is whether behavioral triggers can be built without engineering time, whether the event stream supports attribution past the open, and whether deliverability holds when broadcast volume shares a reputation with product email.
Against behavior-triggered journeys, broadcasts, and winback campaigns measured on revenue, Plunk covers scheduling, event stream, and the suppressions API, and does not cover multi-tenant support. Whether that gap matters depends on how central those are to the build.
- Scheduling: Yes
- Event stream: Yes
- Deliverability: Self-hosted depends on your relay. Hosted plan inherits Plunks reputation.
- Operating since: Not published
- Suppressions API: Yes
- Best published rate per 1,000: Tiers not published in comparable form
- Multi-tenant: No
- Free tier: 3,000/mo on hosted free plan
- Starts at: $19/mo or self-host
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 |