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.
The question here is which one a backend engineer would rather operate. That means SDK depth in the language already in use, whether a retry can safely be replayed, how much the event log tells you when a customer says the email never arrived, and whether the pricing curve stays sane as volume grows.
Against password resets, receipts, and magic links shipped from application code, Plunk covers developer experience, SDK breadth, event stream, and webhook coverage, and does not cover idempotency keys. Whether that gap matters depends on how central those are to the build.
- DX score: 7/10
- SDKs: node, python
- Idempotency keys: No
- Operating since: Not published
- Event stream: Yes
- Best published rate per 1,000: Tiers not published in comparable form
- Webhooks: Yes
- Deliverability: Self-hosted depends on your relay. Hosted plan inherits Plunks reputation.
- Free tier: 3,000/mo on hosted free plan
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 |