[](https://glama.ai/mcp/servers/arbengine/mailbox-mcp) - Physical mail API for AI agents. Send letters, certified mail, postcards, and batch mailings with cost previews, approval controls, trac…
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[](https://glama.ai/mcp/servers/arbengine/mailbox-mcp) - Physical mail API for AI agents. Send letters, certified mail, postcards, and batch mailings with cost previews, approval controls, tracking, and webhooks.
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