Every app needs its own domain. Every domain needs its own mailboxes just to talk to users. Run four products and you’re maintaining four domains, a dozen mailboxes, and five separate tools, before you’ve sent a single email. Mailmark is all of it, once.
One login for every product. No more tool sprawl.
Your products
Re: Partnership proposal
Sounds great, let's schedule a call...
Campaign results Q4
Here are the numbers from last...
Invoice #1042
Please find attached the invoice...
Sent to 1,284 users on app-one.com
Open rate: 42% · Click rate: 12%...
Watch how easy it is to set up your domain, create sender mailboxes, and launch your first email campaign.
Click to play · overview
One product’s email setup is an afternoon. The problem is that it’s an afternoon again for every product you ship, and then it’s yours to maintain forever.
Counts assume 3 mailboxes per product (hello@, support@, team@). Costs use approximate US list prices as of August 2026, taking the cheaper credible option in each category: $7 per mailbox (Google Workspace Business Starter, annual billing), $20 for a sending API (Resend Pro, 50,000 emails), $39 for a campaign tool (Kit Creator, 1,000 subscribers), $15 per warmed sending address (Warmbox, one per product) and $55 for deliverability monitoring (GlockApps Essential). Your own stack will differ. Mailmark plans carry their own monthly sending limits.
From your first product domain to talking to your users, in four simple steps.
Add your domain
DNS Records
Bring all your products under one roof. Add each domain and Mailmark walks you through DNS setup step by step, including MX, SPF, DKIM, and DMARC. No more logging into a different provider for every app you ship.
Your Mailboxes | across all products
Spin up the mailboxes each product needs: hello@, support@, team@. Every product's mail lives in its own inbox, but you manage them all from a single dashboard instead of a dozen logins.
Client A
Need help with setup
Client B
Re: Billing question
Client C
Thanks for the quick fix!
When a user replies, it lands in a familiar email UI: Inbox, Sent, Outbox, Drafts, and Trash. Answer support questions, manage conversations, and search across every product's mail without leaving Mailmark.
Campaign: v2.0 is live
SendingFrom: hello@app-one.com
1,247
Sent
623
Opened
184
Clicked
47
Replied
Follow-up Sequence
Shipped v2? Tell everyone at once. Pick a mailbox, drop in your user list, personalize with merge tags, and send. Each person gets their own email, so it never looks like a mass blast with the whole list in the To field.
One API key per domain, scoped to that product. Transactional and campaign sends hit the same endpoint, from the same reputation you’ve been warming.
import { Mailmark } from 'mailmark-sdk';
const client = new Mailmark(process.env.MAILMARK_API_KEY);
// Transactional: welcome a new signup from your app
await client.send({
from: 'hello@app-one.com',
to: [user.email],
subject: 'Welcome to App One',
html: '<h1>You are in.</h1><p>Thanks for signing up.</p>',
});
// Campaign: tell every user v2 shipped, one email each
await client.send({
from: 'hello@app-one.com',
to: userEmails,
subject: 'v2.0 is live',
html: releaseNotesHtml,
type: 'campaign',
});Choose from 11 themes, set background wallpapers, adjust UI density, and craft professional email signatures, all synced across devices.
Click to play · personalization features
Domains, mailboxes, campaigns, an API, and deliverability, for one product or ten, all in a single platform.
Add every product's domain and manage them side by side. Guided DNS setup gets each one inbox-ready in minutes.
Create hello@, support@, team@ for every product you run. Send from addresses your users recognize and trust.
Manage replies and conversations with a familiar Gmail-like interface. Every product's mail in one place, not a dozen tabs.
Announce a launch or new feature to your whole user base with mail merge, dynamic fields, and automated follow-ups. Personal, never a mass blast.
Send transactional and campaign emails straight from your apps. One API key and the mailmark-sdk package is all your code needs.
Track opens, clicks, replies, and bounces in real time. Know exactly how every campaign performs.
Every new product domain starts cold. Mailmark ramps up volume over 28 days so Gmail and Outlook trust your mail from day one.
Continuously monitor SPF, DKIM, DMARC, and blacklist status across every domain. Get alerted before a problem reaches your users.
Stay compliant with one-click unsubscribe for Gmail and Yahoo. Opted-out users are skipped automatically across every product.
Test every send against Gmail, Outlook, and Yahoo seed inboxes. Know whether you land in Primary, Promotions, or Spam before you hit send.
Bringing on a cofounder or contractor? Invite them, assign mailboxes per product, and manage permissions from one dashboard.
Domains, inboxes, campaigns, an API, and deliverability. Stop paying for and wiring up a separate service for each.
Add every product's domain with guided DNS setup and auto-verification.
Create hello@, support@, team@ and as many addresses as your products need.
Inbox, Sent, Outbox, Drafts, Trash. Handle every product's replies in a complete email client.
Announce launches and updates with mail merge, so every email feels one-to-one.
Multi-stage sequences that send automatically based on recipient behavior.
Real-time tracking for opens, clicks, replies, and bounces per campaign.
SPF, DKIM, DMARC configured automatically so your campaigns reach the inbox.
Send from your own code with a REST API and the mailmark-sdk npm package.
Powering products behind the scenes
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Emails processed
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Verified domains
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Active mailboxes
See why teams choose Mailmark for their email campaigns.
“We switched all our outreach campaigns to Mailmark. Setting up our domain took 5 minutes, and now every campaign goes out from our own address. Open rates jumped 30%.”
Mailmark User
Head of Sales
“Finally, one platform for running email campaigns with real deliverability. No more juggling Mailchimp, a warming tool, and a separate inbox for replies.”
Seasoned Entrepreneur
Startup Founder
“The campaign tools are powerful and the reply management feels just like Gmail. I run outreach from sales@ and newsletters from updates@, all in one place.”
Mailmark User
Marketing Director
Built with
Starter and Pro include a 7-day free trial. Billing details are taken when you start it, nothing is charged until day 8, and cancelling before then costs you nothing.
Try Starter or Pro free for 7 days with full access. Cancel anytime during the trial, no charge.
7-day free trial included
Perfect for your first product's email.
7-day free trial included
For developers running several products at once.
For a whole portfolio of products, with room to grow.
Everything you need to know about Mailmark.
Add your domains, create mailboxes, send updates to your users, and wire up the API, all from one dashboard. Try free for 7 days, no credit card required.