cancel_outbound_mail — mailbox MCP Tool Mutating
cancel_outbound_mail
(cancel outbound mail) is one of 45 tools on the
mailbox
MCP server. Connect the server and your client discovers it on the handshake.
by client
How to call cancel_outbound_mail from your client
- Claude Code mailbox cancel_outbound_mail run in your project directory
- Claude Desktop mailbox cancel_outbound_mail ~/Library/Application Support/Claude/claude_desktop_config.json
- Cursor mailbox cancel_outbound_mail ~/.cursor/mcp.json
- VS Code mailbox cancel_outbound_mail .vscode/mcp.json
- Zed mailbox cancel_outbound_mail ~/.config/zed/settings.json
- Windsurf mailbox cancel_outbound_mail ~/.codeium/windsurf/mcp_config.json
- Cline mailbox cancel_outbound_mail ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
- Gemini CLI mailbox cancel_outbound_mail ~/.gemini/settings.json
- Grok mailbox cancel_outbound_mail .mcp.json (in your project root)
- ChatGPT mailbox cancel_outbound_mail Settings → Connectors → Advanced → Developer mode
- Claude.ai mailbox cancel_outbound_mail Settings → Connectors → Add custom connector
- LangChain mailbox cancel_outbound_mail pip install langchain-mcp-adapters
Fastest route
claude mcp add --transport http mailbox https://mailbox.bot/api/mcpOther tools on this server
- get_mailbox
- get_usage
- list_inbound_forwarding_addresses
- list_inbound_mail
- get_inbound_mail
- list_postal_threads
- get_postal_thread
- get_mailbox_md
- propose_mailbox_md_edit
- send_facility_message
- list_facility_conversations
- get_facility_messages
- update_webhook
- send_outbound_mail
- list_outbound_mail
- get_outbound_mail
- create_test_outbound_mail
- advance_test_outbound_mail
- list_agent_inbox
- get_agent_inbox_context
- get_agent_inbox_sources
- list_agent_inbox_scans
- get_agent_inbox_scan
- get_agent_inbox_activity
- report_agent_inbox_outcome
- get_agent_inbox_handling
- propose_agent_inbox_handling
- seed_agent_inbox_sandbox
- list_webhook_endpoints
- create_webhook_endpoint
- update_webhook_endpoint
- test_webhook_endpoint
- test_webhook_endpoint_with_sample
- rotate_webhook_endpoint_secret
- list_webhook_deliveries
- replay_webhook_delivery
- list_inbound_items
- get_inbound_item_sources
- search_inbound_items
- get_inbound_item
- get_inbound_pages
- quote_inbound_forward
- request_inbound_action
- get_inbound_activity
This list was read from the server itself, by connecting to it and calling tools/list on 24 September 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.