LetterStream’s API helps businesses automate sending mail online.
Still uploading spreadsheets and manually sending documents through a dashboard?
If your systems can talk to each other—but your mail still depends on someone hitting “print”—you’re leaving time, accuracy, and efficiency on the table.
Modern businesses aren’t just adopting digital tools. They’re connecting them. And if you’re still managing physical mail as a separate, manual process, it might be time to bring it into the fold—through automation.
That’s where the LetterStream API comes in.
Meet the LetterStream API: Built for Real Business Workflows
Our Application Programming Interface (API) allows you to trigger physical mail jobs—First-Class, Certified Mail, even FedEx 2Day—directly from your own systems. No more logging in. No more uploading. Just a clean, secure handoff from your database or CRM to the mailbox.
In other words: your software sends the job. LetterStream handles the rest.
Use cases include:
- Triggering Certified Mail when a case status changes in your legal software
- Automatically mailing statements from your billing platform each month
- Sending notices from your internal tools without needing a dashboard or admin
It’s the kind of automation that turns “How do we send this?” into “It’s already sent.”
What Can You Automate with the LetterStream API?
Once integrated, the API allows you to:
- Create mailing jobs in real time
- Upload PDFs and addresses directly from your system
- Specify mail class (First-Class, Certified Mail online, FedEx 2Day)
- Monitor job status through webhooks or queries
- Access delivery confirmations, return receipts, and tracking data automatically
It’s flexible, lightweight, and developer-friendly—built with clean documentation, real code samples, and the support your team actually wants (instead of a 72-page manual with no index).
Need to get HIPAA notices out fast? Want tracking for every customer notice sent as Certified Mail? Done.
Real-World Example: A Law Firm Gets Its Thursdays Back
A midsize legal firm once spent every Thursday printing, assembling, and mailing compliance letters. Tracking Certified Mail was a manual task involving green cards and spreadsheets.
Now, as soon as a case hits a specific milestone in their legal software, a Certified Mail job is sent automatically through the API. It includes:
- The correct recipient
- A templated letter
- Real-time tracking
- Optional electronic return receipt
No late nights. No manual entry. Just automated compliance—and a team that gets to leave the office on time.
Why It’s About More Than Time-Saving
Sure, automation saves time. But when you’re sending critical, regulated, or time-sensitive mail, it also reduces risk. Manual processes come with built-in error potential.
For industries like:
- Healthcare (HIPAA timelines and privacy requirements)
- Legal (court deadlines and delivery proof)
- Finance (statement timing and compliance notices)
- HOAs (violation notices, ballot delivery, late fees)
…the LetterStream API provides a secure, trackable, and documented system for sending mail online, with the confidence of a digital audit trail.
No Platform Overhaul Required
This isn’t a rip-and-replace. You don’t have to change your CRM, build a new dashboard, or train your entire team.
In fact, you don’t even have to start big.
Many of our customers begin by automating one simple use case—like sending First-Class statements each month—and scale from there.
Need help from our team? We’ve got you.
Why Our Smartest Customers Use the API
It’s not just about convenience. It’s about building systems that:
- Reduce human error
- Create consistency across teams
- Maintain compliance
- Free up time for high-impact work
Instead of reacting to last-minute mail needs, your business can operate with proactive, automated workflows that scale with you—without breaking under pressure. That’s the real win.
LetterStream makes print and mail a breeze!
LetterStream offers bulk printing and mailing services, allowing companies to send physical mail online. Whether it’s online Certified Mail, First-Class Mail, FedEx 2Day, or postcards, we give both small businesses and large corporations that time and freedom back to work on tasks that better serve the company. If you’re interested in creating a free account, you can do so here.
