AhaSend vs KumoMTA (2026): which should you pick?
As of Nov 13, 2026, AhaSend grades higher than KumoMTA: 2.4 against 2.2 out of 4.0.
Checked Nov 12, 2026 and Nov 13, 2026 · graded Nov 12, 2026 and Nov 13, 2026 by ToolGPA
AhaSend grades higher on value for money and ease of use. KumoMTA grades higher on the free plan. They get the same grade on features and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
AhaSend
EU-hosted transactional email API and SMTP relay with a free tier
KumoMTA
Open-source mail server for high-volume, self-run email sending
Which one is for you
Pick AhaSend if
- Fits if you want a flat monthly price for transactional email with unlimited domains
- Works for developers who want sandbox mode and inbound routing
Look elsewhere if
- Tight if you stay free: 1,000 emails a month and 1 to 7 days of logs
- Watch out: the page says dedicated IPs start on Pro, but its feature table ties IP access to 100,000 emails a month
- Skip it if you want single sign-on, dedicated IP pools or phone support, which are Max only at $80
- Watch out: the page shows prices in USD or EUR, and the listing records the USD ones
- Not for you if you want ready-made integrations, as none are listed
Pick KumoMTA if
- Fits if you're an engineering team running your own high-volume sending
- Works for senders moving off a commercial mail server who can write Lua
Look elsewhere if
- Skip it if you want a point-and-click setup, since configuration is done in Lua
- Tight if you need support: Silver is business hours only, and Enterprise has no published price
- Not for you if you want a hosted service, as you run it yourself
- Watch out: the pages don't say which operating systems are supported
How we grade them
| 2.4GPAAhaSendFair | 2.2GPAKumoMTAFair | |
|---|---|---|
| Value for money | B$10 a month for 25,000 emails is inside the cheapest quarter of email sending tools, which starts at $10. Max is $80 for 100,000 emails, and extras are $0.50 per 1,000. | CThe software is free under Apache 2, but you host it yourself, and paid support starts at $5,000 per billion messages a year. |
| Free plan and trial | CA free plan with 1,000 emails a month, 3 domains and 1 to 7 days of log retention, no card needed. It is a cap you will hit. | BEvery feature is free to run, with community help on Discord. You do need your own server to use any of it. |
| Features | BREST API and SMTP relay, sandbox mode, local webhooks, inbound routing, a campaign builder and a management API. The listing shows no gap in the core job. | BHigh-volume sending, Lua policy scripting, traffic shaping and IP pools, with hooks into Kafka, AMQP, Prometheus, Grafana and Vault. Nothing in the listing shows a gap in the job. |
| Ease of use | CA web dashboard and API with no rating on record. You verify domains and wire it into your code. | DNo store rating on record. It's configured in Lua scripting on your own servers, so it suits engineers. |
| Platforms and integrations | CWeb only, with an API and no integration list on the pages read. | CSoftware for your own servers, listed for Linux, with Docker and Kubernetes. No dashboard or hosted version. |
| Best for | developers sending transactional email | a free high-volume mail server you run yourself |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: AhaSend and KumoMTA. How we grade
Price against what you get
AhaSend starts at $10 a month and scores 2.3 out of 4 on features, ease of use and platforms. KumoMTA starts at $416.67 a month when paid by the year and scores 2.0.
AhaSend scores higher and starts $406.67 a month lower. Of the other email sending services on the chart, 5 score higher than AhaSend for less, and 30 score higher than KumoMTA for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- KumoMTA is open source and self-hostable, according to its own site.
- AhaSend also covers email campaigns.
At a glance
| AhaSend | KumoMTA | |
|---|---|---|
| Pricing | Free plan | Free plan |
| Starts at | $10 per month for 25,000 emails, billed monthly | $5,000 per billion messages per year for Silver support |
| Free plan | 1,000 emails a month, 3 domains, campaign builder, full Management API, 1 to 7 days of log retention and community support. | The software and all its features are free under the Apache 2 license; community support runs through a Discord server. |
| Free trial | None listed | None listed |
| Web | ||
| Linux | ||
| Made by | AhaSend | Kumo Corp |
| Price read from | ahasend.com | kumomta.com |
| Checked | Nov 12, 2026 | Nov 13, 2026 |
Worth knowing
AhaSend
- The free plan stops at 1,000 emails a month and 1 to 7 days of log retention.
- Dedicated IPs appear from Pro, but the feature table says IP access is at 100,000 emails a month.
- Single sign-on, dedicated IP pools and phone support are limited to the Max plan.
- The page shows prices in USD or EUR; the figures here are the USD ones.
KumoMTA
- It is software you run yourself on your own servers; the pages do not say which operating systems are supported.
- Support is priced per billion messages a year with no server limit; Silver is business hours only, and Enterprise has no published price.
- Configuration is done in Lua scripting, so it suits engineers, not a point-and-click setup.
Key features
AhaSend
- REST API and SMTP relay
- Mail goes out through a RESTful API or an SMTP relay, with official SDKs, a command-line tool and scheduled sending.
- Sandbox mode and local webhooks
- An integration can be built without sending real email, and webhooks and inbound routes can be tested on localhost.
- Inbound email routing
- Incoming mail can be routed to an application, with signed endpoints for webhooks and inbound routes.
- Campaign builder
- A simple and a full editor, contact lists with custom fields, reusable templates, scheduling and test sends are listed, on every plan.
- Platform partner features
- Sub accounts, DNS whitelabeling, per-domain DKIM selectors and bring-your-own DKIM keys are listed for platforms that send for their customers.
KumoMTA
- High-volume sending
- The vendor says a single server can send several million messages an hour, and that it can scale out with Docker and Kubernetes.
- Lua policy scripting
- Behavior is set in Lua scripts, with policy helpers for common configurations.
- Integrations for operations
- Supports webhooks, AMQP, Kafka, Vault, Prometheus, Grafana and direct database access.
- Traffic shaping and IP pools
- A customer quote on the site names traffic shaping and IP pool automation as the parts it builds on.
- Migration guides
- The site has a migration center with pages for moving from Momentum, PowerMTA, Halon, SendGrid and Hurricane MTA.
- Open source
- Released under the Apache 2 license, with the source code on GitHub.
Plans
AhaSend
Free$0
1,000 emails a month, 3 domains, campaign builder, community and best-effort support. No card needed.
Pro$10
per month for 25,000 emails, billed monthly
Flat rate with unlimited domains, dedicated IPs, 0 to 14 days of retention and email support seven days a week.
Max$80
per month for 100,000 emails, billed monthly
Adds OIDC single sign-on, dedicated IP pools, archiving to your own object storage and phone support. Extra emails $0.50 per 1,000.
KumoMTA
Community$0
Free software with every feature. Help comes from the community Discord server; you host it yourself.
Silver$5,000
per billion messages per year
Business-hours support (9-5 US Eastern) by email and portal, a shared sponsor Discord channel and help with basic configuration.
Gold$10,000
per billion messages per year
Support 8-7 US Eastern, a 24/7 critical-issue SLA, a private Discord and help with custom Lua policy.
EnterpriseCustom
24/7/365 support, telephone support, a private Discord or Slack channel and refactored policy scripts. No price is stated; contact the vendor.
Common questions
Which is cheaper, AhaSend or KumoMTA?
As of Nov 13, 2026, AhaSend is cheaper to start with: $10 a month, against $416.67 a month when paid by the year for KumoMTA. AhaSend starts at $10 per month for 25,000 emails, billed monthly, and KumoMTA starts at $5,000 per billion messages per year for Silver support.
Which has a free plan, AhaSend or KumoMTA?
As of Nov 13, 2026, both AhaSend and KumoMTA have a free plan.
Which platforms do AhaSend and KumoMTA run on?
As of Nov 13, 2026, only AhaSend lists a web app and only KumoMTA lists a Linux app. A platform missing from a listing is one its maker's pages did not mention.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.