The complete platform for physical mail.

The industry’s first MCP server for AI agents and a powerful, developer-first API, paired with a self-serve platform featuring the only HTML-based design tool for direct mail. Printed and shipped in 24 hours.

Two paths, one platform

Built for developers. Designed for everyone.

Address verification
with CASS-certified validation on every send. Eliminate returns and wasted postage automatically.
Real-time tracking
via USPS Intelligent Mail barcodes. Know when every piece is printed, in transit, and delivered.
Webhook events
pushed to your app, CRM, or agent workflow the moment a piece is printed, shipped, or delivered.
Template library
with ready-made postcard and letter designs. Customize in seconds and reuse across every campaign.

Design & Send

The only HTML-based design tool for direct mail.

Industry first

HTML Visual Editor

The only direct mail design tool with HTML and CSS under the hood. Full creative control with a visual interface, so you get pixel-perfect results without touching Photoshop, InDesign, or uploading PDFs.

Dynamic content

Variable Personalization

Insert merge fields that populate automatically from your API payload or mailing list. Names, offers, QR codes, tracking URLs, and custom fields that make every piece unique.

Ready to use

Template Library

Use designed postcard and letter templates. Customize colors, images, and text quickly, then save for future campaigns.

Stay on brand

Brand Consistency

Lock colors, fonts, and layouts so every piece meets your brand standards, whether it is sent by your team, your API, or an AI agent.

Scale instantly

Bulk Campaigns

Upload a mailing list or target a geographic radius. Send to 10 addresses or 100,000 in a single click, with address verification on every record.

After you hit send

We own the process from pixel to mailbox.

Most platforms hand your files to a third-party printer and hope for the best. We run the entire manufacturing pipeline in-house, so every piece meets the same standard every time.

  1. Design
    Create or upload
  2. Print
    Same-day Production
  3. Ship
    USPS Handoff
  4. Deliver
    To the mailbox
  5. Track
    Real time visibility
25+
Years of direct mail expertise
24hr
Print-to-ship turnaround
100%
Global downloads
12
MCP tools for AI agents
We are the manufacturer
No middlemen or delays. Your mail goes directly from our floor to USPS, with quality checks.
HITRUST-certified facility
Your data runs in a HITRUST-certified environment with enterprise security and compliance.
25+ years of expertise
Twenty-five years in direct mail, starting with an early online printer in 1998. We’ve tackled every edge case.
Real-time USPS tracking
Track Intelligent Mail barcodes. Know when printed, in transit, and delivered via dashboard, API, or webhooks.

Automate & Integrate

The first physical mail API built for AI agents.

For developers and AI agents

REST API + MCP Server

Send mail with a single API call. Or give your AI agent the same power through our MCP server, with 12 tools for sending, tracking, address verification, and creative generation. The first physical mail MCP server in the ecosystem.

Real-time events

Webhooks

Get notified the moment a piece is printed, mailed, delivered, or returned. Push events to your app, CRM, or agent workflow automatically.

Connected stack

Integrations

Trigger mail from Shopify, Zapier, Make, n8n, or any tool that speaks HTTP. Connect your CRM, e-commerce platform, or AI agent framework without changing your existing workflows.

Event-driven

Automated Triggers

Send one piece on a trigger or 10,000 on a schedule. Automate invoices, onboarding kits, win-back campaigns, and transactional mail from a single endpoint.

Hyperlocal targeting

Radius Mailer

Target every household within a radius of any address. Launch hyperlocal campaigns for new movers, grand openings, or service-area marketing with a few clicks or one API call.

What everyone is saying

Trusted by professionals.

Thanks to MailStream, we’re finding new leads that we never would have found with legal methods.

Tina Y.

VP of Sales, Protocol

MailStream made undercutting all of our competitors an absolute breeze.

Conor N.

Head of Customer Success, TaxPal

We closed a deal in literally a few minutes because we knew their exact budget.

Amy C.

Head of GTM, Pocket

We’ve managed to put two of our main competitors out of business in 6 months.

Veronica W.

CSO, Planeteria

I was able to replace 80% of my team with MailStreamAI bots.

Dillon L.

VP of Sales, Detax

I’ve smashed all my targets without having to speak to a lead in months.

Harriet A.

Account Manager, Commit

Join the best sellers in the business and start using MailStream to hit your targets today.