listmonk vs Mailgun
Both are alternatives to SendGrid. Here's how they stack up — verified facts, no spin.
Also searched as Mailgun vs listmonk — same comparison, one verdict.
listmonk is open source (AGPL-3.0) and Mailgun is not (Proprietary (hosted service)) — so the real question is whether you want to own the transactional & bulk email stack or rent it.
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.
Mailgun
The established competitor — strong on validation and routing.
Mailgun is SendGrid's long-standing rival with a comparable feature set and reputation, plus two things it does distinctly well: email address validation before you send, and inbound routing that parses received mail into your application. Proprietary and hosted, priced per volume with a small free allowance. Listed for the same reason as Render on the Heroku page — many teams comparing this category are choosing between managed vendors, and the honest comparison includes the obvious alternative rather than assuming everyone will self-host.
Side by side
10 points of comparison, every one read from a verified field. Green marks the side that wins a row outright. A dash means we do not hold that fact — never that it is zero.
| listmonk | Mailgun | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 93 | 31 |
| Open source | Yes | No |
| Self-hostable | Yes | No |
| Local-first data | Yes | No |
| License | AGPL-3.0 | Proprietary (hosted service) |
| Pricing | Free and open source. You pay only for the underlying sending. | Volume-based with a small free allowance; paid tiers from about $15/month. Checked 2026-08-05. |
| RAM to run it wellThe figure that actually matters, not the vendor's minimum. | 1 GB | — |
| Realistic running costWhat the box costs each month if you run it yourself. | $6/mo plus SMTP relay costs, against Mailchimp pricing that scales per subscriber | — |
| Setup timeHonest first-install estimate, not the marketing quickstart. | 1 hour for the app, plus the real work below | — |
| Ongoing maintenanceThe part nobody budgets for. | Low for the app. Deliverability is the ongoing job. | — |
listmonk edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Weighing both against staying on SendGrid? Is SendGrid free? What it actually costs →
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
Mailgun
Strengths
- +Strong deliverability record over many years
- +Address validation catches bad addresses before you send
- +Genuinely good inbound routing and parsing
- +Detailed logs and analytics
Trade-offs
- −Proprietary and hosted
- −More expensive than SES for straightforward transactional mail
- −Pricing tiers are harder to read than they should be
- −Support quality varies by plan
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose listmonk
if you want the source and the option to fork it, and you would rather run it on your own hardware, and your data should stay on machines you control.
Choose Mailgun
if strong deliverability record over many years.
Neither, yet
if both carry a real cost you should weigh first — not a transactional sender — pairs with SES or your own SMTP, and proprietary and hosted. If either of those is a dealbreaker for your team, the shortlist is wrong rather than the choice.
What it takes to run these yourself
Real requirements and honest running costs, not the vendor quickstart.
listmonk vs Mailgun — common questions
Is listmonk a better fit than Mailgun for transactional & bulk email?
It depends on what you are optimising for, and the honest split is this: listmonk scores 93 to Mailgun's 31 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. Mailgun earns its place on a different axis — strong deliverability record over many years. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
listmonk keeps its data local or in open formats, so leaving is an export rather than a negotiation. Mailgun keeps your data on its own infrastructure, which is the part to plan for: confirm the export path before you commit, not when you are already trying to leave.
Can I self-host listmonk?
listmonk can be self-hosted; Mailgun cannot, so it stays on the vendor's infrastructure whatever you do.
Are listmonk and Mailgun both alternatives to SendGrid?
Yes — both appear in our SendGrid comparison, which is why they are worth putting side by side. People usually arrive here already having decided to move off SendGrid and now choosing between the two replacements, which is a narrower and much easier question.
Related alternative guides
Facts verified 2026-09-27. Licenses and pricing change — spotted something out of date? That's a correction we want.