Mailpit
Modern local SMTP catcher.
Mailpit is a single-binary local SMTP server and web UI for capturing email during development and testing. It listens on the same 1025 (SMTP) and 8025 (HTTP) ports as MailHog, so it drops into existing setups, and adds faster HTML rendering, full-text search, an HTML and link compatibility check, a spam-score view, and a REST API. It is actively maintained.
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, Mailpit covers none of the capabilities this audience leans on (multi-tenant support, event stream, the suppressions API, scheduling, and webhook coverage), so it fits only where those needs are genuinely absent.
- Multi-tenant: No
- 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: Not applicable; capture-only.
- Webhooks: No
- Starts at: Free
Not applicable; capture-only.
Replacing MailHog in any local or CI email-capture setup.
Teams that need a shared cloud staging inbox rather than a local process per developer.
- › Single Go binary or small Docker image with no runtime dependencies
- › Reuses MailHog's 1025 and 8025 ports, so most existing configs work unchanged
- › Views for rendered HTML, plain text, raw source, headers, and attachments
- › Built-in HTML-compatibility check, link check, and spam-score view
- › REST API and real-time inbox updates for automated tests
- › Local development and staging only, not a production sender
- › No hosted or shared team-inbox mode
Features at a glance
| API | Yes |
| SMTP | Yes |
| SDKs | None |
| Webhooks | No |
| Templates | none |
| React Email | No |
| Batch send | No |
| Scheduled send | No |
| Suppressions | No |
| Multi-tenant | No |
| Inbound parsing | No |
| Event stream | No |
| Idempotency keys | No |
| Dedicated IP | No |