maddy alternatives
Providers that compete with maddy on at least one of: Self-hosted
Composable all-in-one mail server.
Switching as teams building autonomous agents
An agent stack treats email as a two-way primitive. Inbound has to arrive as structured JSON a tool call can consume, sends have to be safe to retry when a model loop repeats itself, and every action needs an audit trail. A provider without inbound parsing only solves half the problem.
maddy does not cover idempotency keys, webhook coverage, event stream, batch sending, and SDK breadth. Postal, Novu, and Plunk close that gap. The order below weighs this audience's priorities first, so it differs from a general popularity ranking.
ranked for teams building autonomous agents
- 01
Postal
Self-hosted TransactionalOpen-source mail delivery platform.
Adds webhook coverage, event stream, batch sending, and SDK breadth over maddy, with nothing given up on these priorities.
Free, self-hosted · Self-hosted only - 02
Novu
Notifications Self-hostedOpen-source notification infrastructure.
Adds idempotency keys, webhook coverage, event stream, batch sending, and SDK breadth, gives up inbound parsing.
30,000 events/mo on cloud, free self-hosted · $250/mo (Business cloud) - 03
Plunk
Self-hosted MarketingOpen-source unified email platform.
Adds webhook coverage, event stream, batch sending, and SDK breadth, gives up inbound parsing and multi-tenant support.
3,000/mo on hosted free plan · $19/mo or self-host - 04
Listmonk
Newsletter Self-hostedSelf-hosted newsletter and mailing list manager.
Adds webhook coverage, event stream, and batch sending, gives up inbound parsing and multi-tenant support.
Free, self-hosted · Self-hosted only - 05
mailcow
Self-hostedDockerized groupware and email server suite.
Adds event stream over maddy, with nothing given up on these priorities.
Free self-hosted, GPL-3.0 · Free self-hosted - 06
Ghost
Newsletter Self-hostedOpen-source publishing with built-in memberships and email.
Adds webhook coverage, batch sending, and SDK breadth, gives up inbound parsing and multi-tenant support.
Self-hosted is free (your infra cost) · Ghost Pro from $9/mo - 07
Cuttlefish
Self-hosted TransactionalOpen-source transactional email server with a web UI.
Adds event stream, gives up inbound parsing.
Free self-hosted, open source · Free self-hosted
maddy and its alternatives, side by side
Columns are the priorities teams building autonomous agents weigh, in order. maddy is the first row so the trade in each direction is readable at a glance.
| Provider | Inbound parsing | Idempotency keys | Webhooks | Operating since | Event stream | Best published rate per 1,000 | Batch sending | SDKs | Multi-tenant |
|---|---|---|---|---|---|---|---|---|---|
| maddy | Yes | No | No | Not published | No | Tiers not published in comparable form | No | None | Yes |
| Postal | Yes | No | Yes | Not published | Yes | Tiers not published in comparable form | Yes | node, ruby, php | Yes |
| Novu | No | Yes | Yes | 2021 | Yes | Tiers not published in comparable form | Yes | node, python, go, php, java, dotnet | Yes |
| Plunk | No | No | Yes | Not published | Yes | Tiers not published in comparable form | Yes | node, python | No |
| Listmonk | No | No | Yes | Not published | Yes | Tiers not published in comparable form | Yes | None | No |
| mailcow | Yes | No | No | Not published | Yes | Tiers not published in comparable form | No | None | Yes |
| Ghost | No | No | Yes | 2013 | No | Tiers not published in comparable form | Yes | node | No |
| Cuttlefish | No | No | No | Not published | Yes | Tiers not published in comparable form | No | None | Yes |
Postal and mailcow add capability without giving anything up on these priorities. The rest trade one thing for another.