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Mailmark

Freemium#30 of 38 in Transactional Email Software

Mailmark: A developer-focused email platform combining API sending, campaigns, mailboxes, and monitoring. Ranked #30 of 38 in Transactional Email Software by our editors (6.1/10); pricing: Free plan · 7-day trial; best for small teams needing inbox and deliverability tools.

6.1/10Editor score

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Mailmark6.1 Visit Mailmark

At a glance

Editor score
6.1 / 10
Pricing
Free plan · 7-day trial
Best for
Small teams needing inbox and deliverability tools
Free plan
Yes
Paid from
$10/mo
Delivery methods
Api
Founded
2024
Facts checked
20 Sep 2026

Where it wins
- Transactional sending through a REST API and npm SDK
- Custom-domain mailboxes with inbox management
- Domain health checks, warming, suppression, and analytics
Where it doesn't
- Free access is limited to one domain and 200 emails per day
- The category specification lists a 1,000-email monthly send limit
- No verified webhooks are listed

Our verdict on Mailmark

Mailmark is an open-source email platform for developers and teams managing multiple products. It combines transactional email sending, campaign delivery, custom-domain mailbox management, inbox access, scheduling, automated sequences, analytics, and deliverability monitoring. Applications can send transactional messages through a REST API, while teams can manage campaigns and mailboxes through the web interface. Its web, API, and self-hosted options make it a fit for small teams that want application-controlled email alongside operational inbox tools.

Mailmark uses a freemium model. New accounts start on a free plan with one domain and up to 200 emails per day. The Starter plan costs $10 per month and includes the REST API, npm SDK, full email UI, user campaigns, and basic support. Pro costs $50 per month and adds priority support to the same listed core capabilities. Business costs $100 per month and includes dedicated support. The category specification lists a 1,000-email monthly send limit, so teams should assess expected volume before choosing it for larger sending programs.

Deliverability is a notable part of the product rather than an add-on around API delivery. Mailmark includes SPF, DKIM, DMARC, MX, and blacklist checks, inbox warming, bounce statistics, suppression and unsubscribe management, and monitoring for delivery signals. Campaigns support per-recipient tracking, scheduling, analytics, and personalization in application code. This combination suits teams that need domain and inbox oversight as well as transactional delivery. Teams requiring higher sending capacity or verified webhooks should consider an alternative; Mailmark is better aligned with smaller product teams that value mailbox management and deliverability controls.

Your product? Our editors can test Mailmark in depth and publish a review, labelled as paid · from $149/mo →

Mailmark pricing

Plans Free plan · 7-day trialFreemium A usable free plan; paid tiers unlock the limits above. Prices checked 20 Sep 2026.

See plans on mailmark.dev

All 3 Mailmark plans and prices →

Mailmark fact sheet

Free plan	Yes
Paid from	$10/mo
Delivery methods	Api
Template options	Code
Event webhooks	Not verified
Delivery log retention	Not verified
Dedicated IP option	Not verified
Monthly send limit	1000 emails/mo
Free trial	7 days · card required
Deployment	Cloud, Self-hosted, Browser extension
Platforms	Web
Compliance & security	GDPR
Support	Docs
Built for	Solo, Small business, Mid-market (editorial estimate)
Pricing	Free plan · 7-day trial (source)
Website	mailmark.dev
Facts checked	20 Sep 2026

Alternatives to Mailmark

See all Mailmark alternatives →

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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Mailmark for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.

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Featured on iTechGuides

Mailmark is listed in our Transactional Email Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update