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.
A SaaS product sends on behalf of its customers, so the deciding factors are tenant isolation, whether suppressions can be scoped rather than global, and whether support can answer why one specific account did not receive one specific email. Lifecycle automation and transactional sending usually need to coexist.
Against trial expiry notices, dunning, onboarding sequences, and per-tenant transactional mail, Plunk covers event stream, the suppressions API, scheduling, and webhook coverage, and does not cover multi-tenant support. Whether that gap matters depends on how central those are to the build.
- Multi-tenant: No
- Event stream: Yes
- Suppressions API: Yes
- Operating since: Not published
- Scheduling: Yes
- Best published rate per 1,000: Tiers not published in comparable form
- Deliverability: Self-hosted depends on your relay. Hosted plan inherits Plunks reputation.
- Webhooks: Yes
- 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 |