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55 hosted tools: Batch & Postcards (estimate_batch_mail, create_batch_mail from a template link with inline recipients, get_batch_mail_proof, confirm_batch_mail, get_batch_mail, list_batch_mail, cancel_batch_mail, advance_test_batch_mail) plus quote_outbound_mail and send_text_letter. Live catalog: https://mailbox.bot/api/mcp/tools-public