Plug direct mail into the tools you already use.

MailStream connects to your existing tech stack through native integrations, no-code automation platforms, and a REST API that works with any system that can make HTTP calls.

Native integrations

Pre-built connections for popular platforms.

Install, authenticate, and start sending. Native integrations handle the plumbing so you can focus on the campaign.

Shopify

Shopify

Trigger postcards and letters from Shopify order events, new purchases, abandoned carts, win-back flows. Install the app and map your workflows without writing code.

Zapier

Zapier

Connect MailStream to 6,000+ apps through Zapier. Send a postcard when a form is submitted, a deal closes, or a customer hits a milestone, no developers required.

Make (Integromat)

Make (Integromat)

Build visual automation scenarios that include physical mail steps. Make's module lets you create postcards, letters, and verify addresses within complex multi-step workflows.

HubSpot (Coming Soon)

HubSpot (Coming Soon)

Trigger direct mail from HubSpot workflows. Send personalized postcards when contacts enter a lifecycle stage, complete a form, or haven't engaged in 90 days.

Salesforce (Coming Soon)

Salesforce (Coming Soon)

Automate the creation of compliance letters, renewal reminders, and prospecting mail directly from Salesforce records. This includes native integration with flow builder support.

GoHighLevel (Coming Soon)

GoHighLevel (Coming Soon)

Agencies using GoHighLevel can add direct mail triggers to client workflows, birthday postcards, appointment reminders, and re-engagement campaigns.

ActiveCampaign (Coming Soon)

ActiveCampaign (Coming Soon)

Automatically trigger direct mail campaigns from ActiveCampaign automations. Send personalized postcards when contacts enter a specific sequence, achieve a goal, or become inactive, all without any manual effort required.

Klaviyo (Coming Soon)

Klaviyo (Coming Soon)

Enhance your email marketing strategies by incorporating physical mail. Send personalized postcards for abandoned carts, celebrate VIP moments, and execute effective win-back campaigns directly from Klaviyo.

n8n (Coming Soon)

n8n (Coming Soon)

Design customized workflows that seamlessly integrate direct mail components. This includes sending out eye-catching postcards, ensuring accurate address verification, and launching campaigns effortlessly.

Build your own

Custom integrations for any workflow.

Not every tech stack has a pre-built connector. MailStream gives you multiple integration paths so you can connect physical mail to any system.

REST API
lets any system that can make HTTP requests integrate with MailStream. Bearer token auth, JSON responses, and a full sandbox for development.
Webhooks
push delivery status events to your application in real time. Update CRM records, trigger follow-up actions, or feed analytics dashboards.
MCP Server
gives AI agents native access to physical mail. The MailStream MCP server works with Claude, GPT, LangChain, and any MCP-compatible framework.
CSV upload
is for teams that don't need an API integration. Upload a CSV of recipients directly in the dashboard, MailStream verifies addresses and handles the rest.