Talk to sales

See MailStream in action.

Walk through the API, the MCP server for AI agents, and our HTML-based design tool with a real engineer. Leave with a clear price for your volume and a path to production in days, not months.

  • See the API, MCP server, and design tool in 20 minutes
  • 24-hour print and ship in the US, with address verification built in
  • Walk through pricing for your volume, no spreadsheets required
  • HITRUST-aligned print pipeline for healthcare and financial services

Loved by developers, marketers, and ops teams shipping physical mail.

Prefer to start without a call? See pricing or read the API docs.

Request a demo

Tell us a little about your team. We’ll reach out within one business day.

We respond within one business day. No sales-call ambush.

What MailStream does

One platform for every piece of physical mail.

MailStream pairs a developer-first API and MCP server with a self-serve dashboard and the only HTML-based design tool for direct mail. Postcards, letters, and checks, printed and shipped in 24 hours, anywhere in the US.

API + MCP for AI agents
A developer-first REST API and the industry’s first MCP server, so humans and agents alike can send physical mail with a single integration.
HTML-based design tool
The only design tool for direct mail that speaks HTML and CSS. Reuse your templates, variables, and brand system without learning new software.
24-hour print & ship
Postcards, letters, and checks printed and dropped at USPS in 24 hours. Self-serve or API, same pipeline, same SLA.
Address verification
Every address is validated and corrected against USPS data before printing, so you only pay for mail that can actually be delivered.
Webhooks & event stream
Real-time delivery, scan, and return events so your CRM, helpdesk, or AI agent always knows where every piece of mail stands.
Built for compliance
HITRUST-aligned print, certified mail with proof of delivery, and audit trails for every send. Trusted by healthcare and financial services teams.

We switched from Lob and cut our per-piece cost by 30%. The API was easier to integrate, and pieces ship same day instead of waiting 3–5 days.

Daniel H.

VP of Growth, Northbridge Labs

Demo questions

Everything you might be wondering.
How long is the demo?
Typically 20–30 minutes. We walk through the API, the MCP server for AI agents, the HTML design tool, and the parts of the pipeline that matter for your use case. No 90-minute discovery calls.
Who from MailStream will I be talking to?
A solutions engineer who can actually open a terminal and answer technical questions, not a generic SDR. If we need a specialist (e.g. for HIPAA workflows or high-volume mailings), we’ll bring them in.
Do I need a credit card or contract to book a demo?
No. Demos are free and there’s no contract required to start sending after. MailStream is pay-as-you-go from day one; Growth and Enterprise plans are opt-in once you’re ready for volume pricing.
Can I try MailStream without a demo?
Absolutely. Sign up and start in sandbox mode, no charges until you send a real piece. The demo is for teams who want a tour, pricing guidance, or compliance details before they integrate.
What if I’m already prototyping with an AI tool?
You’re in the right place. Our MCP server and REST API are designed to slot into existing AI agents and prototype stacks. Bring your code (or your prompt) and we’ll show you the production path.
How quickly will someone get back to me?
Within one business day, usually faster. If you’re on a tight timeline, mention it in the form and we’ll prioritize.