Open source alternatives to Mailgun

One project on starwire does the same job. Ranked by how much of what Mailgun does each one covers, read from its README and website. Ties go to the most active.

What Mailgun does

Transactional email APIcore
SMTP relaycore
Inbound email routing
Email validation
Delivery logs and analytics
Webhooks for events
Templates
Dedicated IPs

Each dot in the table is one job, in this order. Square dots are core jobs and count double. Full means yes, half means partly. "See the evidence" under a project shows the line behind each one. Coverage is what a project documents, not how well it works or how hard it is to move to. How we score this

Project	Covers	Stars	Commits, 12 weeks	Last release	Closed vs opened	Setup	License
e2aEmail API for apps and agents, hosted or self-hosted with Docker	Replaces it75%	199	135	35 days ago	100%	Hosted, free plan	Apache-2.0
Covers all 2 core jobs. Partly: Delivery logs and analytics. Not shown: Email validation; Dedicated IPs.See the evidence Transactional email APIcoreYesSend transactional email SMTP relaycoreYesagents send to other agents (SMTP relay) Inbound email routingYesbridges inbound mail to a local HTTP handler Email validationNot shownNeither the README nor the website mentions it. Delivery logs and analyticsPartlyserver-derived reply/delivery facts Webhooks for eventsYessigned webhooks, WebSocket delivery TemplatesYesEmail templates (beta) Dedicated IPsNot shownNeither the README nor the website mentions it.

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