Postal vs listmonk
Both are alternatives to SendGrid. Here's how they stack up — verified facts, no spin.
Also searched as listmonk vs Postal — same comparison, one verdict.
Postal
Run your own mail server, properly — MIT, and complete.
Postal is a full self-hosted mail platform: sending, receiving, bounce handling, click and open tracking, DKIM signing and a web interface — the parts you would otherwise assemble from Postfix, OpenDKIM and a database. MIT, around 17k stars. It is the only option here where addresses never leave your infrastructure, which for GDPR-sensitive senders is not a preference but a requirement. The honest warning: running a mail server well is a real discipline, and reputation is unforgiving of mistakes.
listmonk
Self-hosted newsletters — a single binary handling millions.
listmonk is a self-hosted newsletter and mailing-list manager: subscriber management, segmentation, templates, analytics and bounce processing, as one Go binary with Postgres behind it. AGPL-3.0, around 23k stars, and documented as handling millions of subscribers on modest hardware. It is not a transactional sender — it hands off to SES or your own SMTP — which makes it a complement rather than a competitor. For anyone paying Mailchimp per subscriber for a newsletter, this removes that bill entirely.
Side by side
| Postal | listmonk | |
|---|---|---|
| Sovereignty Score | 94 | 93 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first | Yes | Yes |
| License | MIT | AGPL-3.0 |
| Pricing | Free and open source. You supply the server and the IP reputation. | Free and open source. You pay only for the underlying sending. |
Postal edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Postal
Strengths
- +MIT with no enterprise carve-out
- +Recipient addresses never leave your infrastructure
- +Full platform — sending, receiving, bounces, tracking, DKIM
- +No per-email cost at any volume
Trade-offs
- −You own IP reputation, and warming takes weeks of care
- −Running mail well is a genuine specialism
- −Blocklists are unforgiving of configuration mistakes
- −No shared warmed pool to fall back on
listmonk
Strengths
- +Removes per-subscriber pricing entirely
- +One Go binary plus Postgres — genuinely simple to run
- +Handles very large lists on modest hardware
- +Subscriber data stays on your infrastructure
Trade-offs
- −Not a transactional sender — pairs with SES or your own SMTP
- −AGPL-3.0 needs reading before embedding it in a product
- −No shared IP reputation; deliverability is yours
- −Fewer templates than the commercial platforms
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Facts verified 2026-08-05. Licenses and pricing change — spotted something out of date? That's a correction we want.