Resend-grade API · TrekMail-grade mailboxes

Transactional email, mailboxes, and marketing — one platform, one domain.

Ship product email through a typed API, give your team real mailboxes, and run campaigns — all sharing the same reputation, contacts, and history. Built for developers, agencies, and everyone in between.

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4: Products, one domain
GB: Data residency

Outbound

Message #E-2048

from: [email protected]
to: [email protected]
subject: Your receipt is ready

202 Accepted~120ms

✓ Delivered · Gmail

✓ DKIM signed

Four products · zero silos

Everything that sends from your domain, finally in one place.

Most teams glue together an API, a mailbox host, and a marketing tool. MailMarco is all three — sharing one reputation, one contact list, one bill.

01 · API

Developer Email

A clean REST API and typed SDKs to send transactional email at scale. Webhooks, idempotency, scheduling, and batch sends built in.

POST /v1/emails
Node, HTTP & SMTP
Webhooks + event log

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02 · Mailboxes

Business Email Hosting

Real IMAP/SMTP mailboxes on your own domain, provisioned in seconds. Give the whole team human inboxes next to your app traffic.

IMAP & SMTP
Custom domains
Shared aliases

Learn more

03 · Campaigns

Marketing

Design broadcasts, segment contacts, and automate journeys — reusing the exact same reputation and contacts as your product email.

Segments & lists
Automations
A/B testing

Learn more

04 · White-label

Agency & White-label

Run MailMarco under your own brand and domain. Multi-tenant workspaces, per-client billing, and a fully rebrandable dashboard.

Multi-tenant
Your brand & domain
Per-client billing

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Why MailMarco

The boring parts, handled. The important parts, yours.

Deliverability, compliance, and data residency are table stakes we obsess over — so your team can focus on the message, not the machinery.

Deliverability by default

Managed SPF, DKIM & DMARC, warmed pools, and signed VERP return-paths so bounces land where they belong — not in a black hole.

Declared data residency

All data is stored and processed in Manchester, United Kingdom, under UK GDPR. Your organization's region is recorded, enforced against your domain configuration, and locked against silent relabelling.

Unified contact history

One timeline per contact across transactional, mailbox, and marketing email. No more three tools telling three stories.

White-label to the pixel

Your logo, your palette, your domain on every dashboard, email footer, and tracking link. Your clients never see ours.

Built for developers

One POST away from your first send.

A predictable REST API with idempotency keys, webhooks, scheduling, and batch sends — plus a fully typed Node SDK. No SMTP archaeology required.

Idempotent sends — safe retries, exactly-once delivery
Typed responses & errors, first-class TypeScript
Webhooks for delivered, opened, bounced & complained

Read the API reference →

send-email

curl https://api.mailmarco.com/v1/emails \
  -H "Authorization: Bearer mm_live_..." \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: rcpt_9f2b" \
  -d '{
    "from": "[email protected]",
    "to": "[email protected]",
    "subject": "Your receipt is ready",
    "html": "<h1>Thanks for your order</h1>"
  }'

# → 202 Accepted
# { "id": "e_2048xyz", "status": "queued" }

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