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Mailmark

by Mailmark

Free plan APISelf-hostedWeb

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Mailmark's own site

What Mailmark is

Mailmark combines custom-domain email hosting, inbox management, campaigns, an API, and deliverability tools for developers managing multiple products. Guided DNS setup and automatic verification cover MX, SPF, DKIM, and DMARC records. Its inbox includes Inbox, Sent, Outbox, Drafts, and Trash, with rich-text composition, attachments, and full-text search. Campaigns provide mail merge, personalized fields, automated follow-ups, and tracking for opens, clicks, replies, and bounces. A REST API and typed JavaScript and TypeScript npm package support transactional and campaign email, scheduling, sequences, and delivery statistics. Mailmark says it ramps sending volume for each new product domain over 28 days, monitors authentication and blacklist status, and tests inbox placement against Gmail, Outlook, and Yahoo seed inboxes. Teams can invite collaborators, assign product mailboxes, and manage permissions centrally. The project is open source and self-hostable. Plans start at $10 a month, with a 7-day trial.

Who it suits

Mailmark suits developers handling email for multiple products who need hosting, campaigns, APIs, and deliverability monitoring. Its self-hosting and team controls also suit organizations managing their own infrastructure and mailboxes.

What it does well

  • Combines hosting, campaigns, API, and analytics
  • Guided verification for MX, SPF, DKIM, and DMARC
  • Offers typed JavaScript and TypeScript SDK
  • Supports self-hosting and open source use
  • Includes one-click unsubscribe for Gmail and Yahoo

What to know first

  • Starter plan allows 1,000 emails monthly
  • Paid plans start at $10 a month
  • Sending warm-up takes 28 days per domain

Plans

PlanBilled and limitsPrice
Starter$10/per month · 1,000 emails / month · 500 contacts · 1 custom domain · 3 mailboxes · Full email UI · User campaigns · REST API & npm SDK · Basic support$10 a month
Pro$50/per month · 25,000 emails / month · 10,000 contacts · 5 custom domains · Unlimited mailboxes · Full email UI · User campaigns · REST API & npm SDK · Priority support$50 a month
Business$100/per month · 100,000 emails / month · 50,000 contacts · Unlimited domains · Unlimited mailboxes · Full email UI · User campaigns · REST API & npm SDK · Dedicated support$100 a month

As mailmark.dev lists them, read 4 Oct 2026. The maker's own page has the final word.

Verdict

Mailmark covers operational email needs from DNS setup through campaigns and delivery monitoring. Its open-source, self-hosted model and developer APIs are balanced by plan-based sending limits.

Facts from Mailmark's own pages

API and SDK
Mailmark provides a REST API and a typed JavaScript and TypeScript npm package for transactional and campaign email, scheduling, sequences, and delivery stats. · mailmark.dev, 4 Oct 2026
Campaigns
Campaigns support mail merge, personalized fields, automated follow-ups, and tracking for opens, clicks, replies, and bounces. · mailmark.dev, 4 Oct 2026
Deliverability
It monitors SPF, DKIM, DMARC, and blacklist status and offers inbox placement testing against Gmail, Outlook, and Yahoo seed inboxes. · mailmark.dev, 4 Oct 2026
Delivery methods
api · mailmark.dev, 20 Sept 2026
Domains
It offers guided DNS setup and auto-verification for MX, SPF, DKIM, and DMARC records. · mailmark.dev, 4 Oct 2026
Founded
2024 · mailmark.dev, 28 Sept 2026
Free plan
Yes · mailmark.dev, 20 Sept 2026
Inbox
The email interface includes Inbox, Sent, Outbox, Drafts, and Trash, with rich-text composition, attachments, and full-text search. · mailmark.dev, 4 Oct 2026
Infrastructure
Mailmark says it runs on AWS across multiple availability zones and uses AWS SES for delivery and S3 for storage. · mailmark.dev, 4 Oct 2026
Monthly send limit
1000 · mailmark.dev, 20 Sept 2026
Open source and self-hosting
Mailmark describes itself as an open-source project and says it is self-hostable; it began as a solo project in 2024. · mailmark.dev, 4 Oct 2026
Product
Mailmark combines custom-domain email hosting, inbox management, campaigns, an API, and deliverability tools for developers managing multiple products. · mailmark.dev, 4 Oct 2026
Security
Mailmark says data is encrypted in transit with TLS 1.3 and at rest with AES-256, including email content, attachments, account data, and backups. · mailmark.dev, 4 Oct 2026
Paid from
10 · mailmark.dev, 20 Sept 2026
Support
The documentation page says its support team typically responds within 2 hours on business days. · mailmark.dev, 4 Oct 2026
Team features
Teams can invite collaborators, assign mailboxes by product, and manage permissions from one dashboard. · mailmark.dev, 4 Oct 2026
Template options
code · mailmark.dev, 20 Sept 2026
Unsubscribes
Mailmark supports one-click unsubscribe for Gmail and Yahoo and automatically skips opted-out users across products. · mailmark.dev, 4 Oct 2026
Warm-up
Mailmark says it ramps up sending volume for each new product domain over 28 days. · mailmark.dev, 4 Oct 2026

Where Mailmark stands on Freedom251

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