Mailsflux
New: Physical Mail API is now live

One API for All Your Email

Unified platform for digital email and physical mail. Developer-ready in minutes, visual editor for marketers, 99.97% delivery guaranteed.

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99.97%
Delivery Rate
180+
Countries Covered
<280ms
Avg Send Latency
mailsflux-sdk · send_mail.ts
// Initialize SDK
import { Mailsflux } from '@mailsflux/sdk';
const client = new Mailsflux({
apiKey: 'mf_live_•••••••',
});
// Send a transactional email
await client.email.send({
from: '[email protected]',
to: '[email protected]',
subject: 'Your order has shipped 🎉',
template: 'order-shipped',
vars: { name: 'John', trackingId: 'MF-2024-88832' }
});
200 OK · Email queued·↳ 217ms

Supported languages & frameworks

🟢Node.js
🐍Python
🔵Go
🐘PHP
☕Java
🦀Rust
💎Ruby
🟢Node.js
🐍Python
🔵Go
🐘PHP
☕Java
🦀Rust
💎Ruby
Core Features

Built for Scale

From your first email to millions per month, Mailsflux grows with your business.

🚀

Transactional Email API

Trigger in milliseconds. Supports template variables, attachments, HTML and plain text. Full Webhook event notifications.

📮

Physical Mail API

Send envelopes, postcards, or parcels with one line of code. 180+ countries covered with end-to-end tracking.

📊

Smart Audience Management

Custom tags and behavioral segmentation with real-time dynamic lists. Supports CSV import and direct database sync.

📍

Address Validation

Automatically validate addresses before sending. AI-powered correction and format standardization. Bounce rate under 0.1%.

📦

Real-time Shipment Tracking

Full node-by-node tracking for every physical mail piece. Webhook push notifications on status changes.

🔒

Security & Compliance

One-click SPF / DKIM / DMARC setup, GDPR compliant, AES-256 encryption for all data at rest.

Live Dashboard

One Dashboard, Full Visibility

All data from digital email and physical mail in one place. Open rates, click rates, shipping nodes — all synced in real time.

1.28M
Monthly Sends
↑ 23.4%
47.3%
Avg Open Rate
↑ 5.2%
8.9%
Click-through Rate
↑ 1.8%
0.08%
Bounce Rate
↓ 0.03%
Mailsflux Dashboard · Delivery Tracking
Weekly Sends
Recent Sends
ZW
Delivered
LM
Opened
WF
Clicked
CJ
Delivered
Deliverability

Industry-Leading Delivery Guarantee

Our infrastructure is designed from the ground up for high deliverability. AI routing + real-time monitoring ensures every email reaches the inbox.

AI-powered smart routing that automatically selects the optimal outbound IP
Real-time blocklist monitoring with automatic failover in seconds
One-click SPF / DKIM / DMARC configuration
Automatic IP warm-up scheduling to protect domain reputation from day one
Domain reputation score dashboard with real-time visibility
99
Domain Reputation Score
Out of 100 · Top 1% industry
99.97%
Delivery Rate
0.08%
Bounce Rate
0.01%
Complaint Rate
🔥 Automatic IP Warm-up Progress
Phase 1Cold Start — Days 1–5 · Completed — 100/day
Phase 2Ramp-up — Days 6–14 · In Progress — 5,000/dayIn Progress
Phase 3Full Volume — Day 15+
Pricing

Transparent Pricing, Scales with You

No hidden fees on any plan. Start free, upgrade when you're ready.

Free

$0/mo

Perfect for personal projects and early-stage validation

5,000 digital emails/mo
100 physical mail pieces/mo
Basic API access
3 sending domains
Email template editor
Most Popular

Growth

$29/mo

For fast-growing SaaS and e-commerce teams

100,000 digital emails/mo
1,000 physical mail pieces/mo
Full API + Webhooks
Unlimited sending domains
Advanced visual editor
Priority email support

Enterprise

Custom

For enterprises with compliance, SLA, and high-volume needs

Unlimited digital emails
Unlimited physical mail
Dedicated IP pool
99.9% SLA guarantee
Dedicated customer success manager
Private deployment option

Have more questions?Contact us for a custom plan

FAQ

Common Questions

Can't find an answer? Reach out to our support team — we typically reply within 2 hours.

What types of physical mail does the API support?

What happens when I exceed my sending quota?

How do you ensure emails don't go to spam?

Can I use a custom sending domain?

Where is data stored? Is it GDPR compliant?

Do I need a credit card for the free plan?

Get Started

Up and running in 5 minutes,
starting today

Send your first email for free. No credit card. No complex setup.

Sign Up Free →Book a Demo
Mailsflux

Unified email infrastructure platform. Scale your transactional email, simplify your marketing workflow.

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