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.
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, maddy covers multi-tenant support, and does not cover event stream, the suppressions API, scheduling, and webhook coverage. Whether that gap matters depends on how central those are to the build.
- Multi-tenant: Yes
- Event stream: No
- Suppressions API: No
- Operating since: Not published
- Scheduling: No
- Best published rate per 1,000: Tiers not published in comparable form
- 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.
- Webhooks: No
- 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 |