maddy
Composable all-in-one mail server.
maddy is a self-hosted mail server that implements SMTP for outbound and MX receipt, IMAP storage, DKIM, SPF, DMARC, DANE, and MTA-STS. It replaces the classic Postfix plus Dovecot plus OpenDKIM style stack with one daemon and one configuration model.
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, maddy covers multi-tenant support, and does not cover scheduling, event stream, and the suppressions API. Whether that gap matters depends on how central those are to the build.
- Scheduling: No
- Event stream: No
- Deliverability: Self-hosted deliverability depends on DNS, IP reputation, queue management, bounce handling, and ongoing abuse controls. maddy includes DKIM, SPF, DMARC, DANE, and MTA-STS building blocks.
- Operating since: Not published
- Suppressions API: No
- Best published rate per 1,000: Tiers not published in comparable form
- Multi-tenant: Yes
- Free tier: Free self-hosted, GPL-3.0
- Starts at: Free self-hosted
Self-hosted deliverability depends on DNS, IP reputation, queue management, bounce handling, and ongoing abuse controls. maddy includes DKIM, SPF, DMARC, DANE, and MTA-STS building blocks.
Infrastructure teams that want a compact self-hosted mail server with modern authentication primitives.
Product teams that need managed deliverability and support.
- › Single daemon replaces several traditional mail-server components
- › Implements SMTP, MX receipt, IMAP, DKIM, SPF, DMARC, DANE, and MTA-STS
- › GPL-3.0 licensed and actively documented
- › Self-hosted email remains operationally demanding
- › IMAP storage is documented as beta on the project site
- › No hosted SaaS plan or support pricing was found on the official site
Features at a glance
| API | No |
| SMTP | Yes |
| SDKs | None |
| Webhooks | No |
| Templates | none |
| React Email | No |
| Batch send | No |
| Scheduled send | No |
| Suppressions | No |
| Multi-tenant | Yes |
| Inbound parsing | Yes |
| Event stream | No |
| Idempotency keys | No |
| Dedicated IP | No |