Mailflow
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EMAIL INFRASTRUCTURE FOR DEVELOPERS

Email that gets
there. Every time.

Transactional email delivery you can count on. Send at scale with a simple REST API or authenticated SMTP, and focus on what you're building.

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Built for the emails your product depends on.
Mailflow email infrastructure delivering messages to a mobile inbox
BUILT FOR YOUR STACK

The pieces that keep email moving

A dependable foundation for sending transactional messages, built around the workflows developers already use.

REST API Integration
01
  • One POST /api/v1/send request
  • Test keys sandbox, Live keys deliver
  • Idempotency keys stop double sends
Authenticated SMTP
02
  • STARTTLS with AUTH PLAIN or LOGIN
  • Your API key is the password
  • Same rules as the REST API
Domain Verification
03
  • 2048-bit DKIM key per domain
  • SPF alignment and DMARC checks
  • Rechecked automatically
Projects & API Keys
04
  • Separate Test and Live environments
  • Keys with scoped permissions
  • IP allow-lists for Live keys
Reliable Background Delivery
05
  • Sent by dedicated delivery workers
  • Automatic retries with backoff
  • Never sent twice to a recipient
Bounces & Complaints
06
  • Bounces and complaints recorded
  • Feedback reports read automatically
  • Affected addresses suppressed
Suppression Lists
07
  • Added from bounces and complaints
  • Manage by hand or with the API
  • Suppressed recipients are skipped
Email Templates
08
  • {{variables}} in subject and body
  • Send with a template_id
  • Separate Test and Live templates
Webhooks
09
  • Delivery, suppression and domain events
  • Signed with HMAC-SHA256
  • Retried, with a full delivery log
Usage Analytics
10
  • Accepted, bounced and failed counts
  • Filter by project and period
  • Drill into any single message
STRAIGHTFORWARD PRICING

Pay for what you send

Usage-based pricing, with the proposed rate shown clearly as provisional until confirmed.

Pricing details
Proposed · awaiting confirmation5 RWFper email

This proposed rate is not yet a confirmed price. The unit and amount remain configurable.

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FOR DEVELOPERS

Integrate in a few clear steps

Create a project, authenticate a sending domain, and wire transactional email into your application. Credentials stay on your server.

Explore developer guide
  1. 01
    Create an account

    Access your Mailflow workspace.

  2. 02
    Set up a project

    Keep each application organized.

  3. 03
    Verify your domain

    Configure SPF, DKIM and DMARC.

  4. 04
    Integrate and monitor

    Keep keys secure and follow delivery events.

READY WHEN YOU ARE

Build on a better way to send.

Start with a Mailflow workspace for your application.

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