MailStream vs PostPilot
MailStream
mailstream.app
PostPilot
postpilot.comSide by side
| Figure | MailStream | PostPilot |
|---|---|---|
| Price from | — | $82.50/mo |
| Free plan | — | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 0 | 7 |
| Spec score · Direct Mail Automation Software | 7.3 (#18) | 8.6 (#5) |
| Integrations | The integrations page describes Planning Center as available and lists several others, including Shopify, Zapier, Make, and n8n, as coming soon. | The integration directory lists 14 integrations and highlights Shopify, Klaviyo, Attentive, Postscript, Yotpo, Orita, Swym, StayAI, Skio, Smile and Digioh. |
| Product | MailStream provides a self-serve platform, REST API, and MCP server for sending physical postcards and letters. | PostPilot provides a direct mail platform for ecommerce brands to acquire, retarget, and retain customers with postcard and catalog campaigns. |
| Support | The security page says MailStream will share SOC 2 reports, complete security questionnaires, and arrange calls with its security team. | The site lists [email protected] as its support contact. |
| What it does | MailStream provides a self-serve platform, REST API, and MCP server for sending physical postcards and letters. | PostPilot is a direct-mail marketing platform for ecommerce brands that sends personalized postcards, catalogs and handwritten cards across acquisition, retargeting and retention. |
Plans
PostPilot
- FreeFree
- Growth$82.50 a month
- Growth Services$82.50 a month
- Pro$419 a month
- Pro Services$419 a month
- EnterprisePriced on request
- Enterprise ServicesPriced on request
In their own words
MailStream
MailStream provides a self-serve platform, REST API, and MCP server for sending physical postcards and letters domestically. Postcards are offered in 4×6, 6×9, and 6×11 inch sizes, while letters use HTML templates or uploaded PDFs in white #10 double-window envelopes. A browser HTML and CSS editor supports personalized designs, reusable templates, and print proofs. Variable fields can add names, offer codes, QR links, account numbers, and balances. MailStream says it CASS-verifies addresses before printing and flags invalid or incomplete entries. USPS Intelligent Mail barcodes expose status through the dashboard, API, or webhooks. Printing and USPS handoff are listed at 1 to 2 business days, for campaigns targeting 10 to 100,000 addresses. Integrations include Shopify, Zapier, Make, n8n, and HTTP tools. The hosted MCP server lists 27 tools. A free plan is available; paid access starts at $99/mo. Security features include TLS 1.2 or higher, AES-256 at-rest encryption, annual SOC 2 Type 2 audits, and HIPAA handling with BAAs.
PostPilot
PostPilot is a direct mail platform for ecommerce brands using postcards and catalogs to acquire, retarget, and retain customers. Campaigns cover prospecting, retargeting, abandoned carts, loyalty, subscriptions, winback, and retail. MailMatch links email addresses with physical mailing addresses. AcquisitionAI helps find lookalike prospects, while SiteMatch retargets anonymous site browsers. Reporting includes real-time dashboards, holdout-tested iROAS measurement, and cross-channel attribution. Listed integrations include Shopify, Klaviyo, Yotpo, Attentive, Omnisend, Recharge, Loyalty Lion, and Loop Subscriptions; an open API can connect other systems to campaigns. PostPilot automatically tracks Shopify customers who receive a postcard or handwritten card for 60 days. There is no sending minimum. The free plan has no platform cost, but postcards and postage are paid separately. Growth costs $82.50 a month with annual billing; monthly billing is 99 USD per month. Its AI prospecting data fee is $0.07. Pro costs $419 a month with annual billing, and Enterprise pricing is custom.