{
  "name": "mail.pop3.fetch",
  "description": "Fetches messages from a POP3 mailbox using child-node options and a required [.lambda] callback",
  "signature": {
    "children": {
      "raw": {
        "type": "bool",
        "description": "Whether to pass raw MIME text to the callback",
        "required": false,
        "mode": "ValueOrExpression",
        "cardinality": "ZeroOrOne",
        "role": "Option",
        "projection": "Value"
      },
      "max": {
        "type": "int",
        "description": "Maximum number of messages to fetch",
        "required": false,
        "mode": "ValueOrExpression",
        "cardinality": "ZeroOrOne",
        "role": "Option",
        "projection": "Value"
      },
      ".lambda": {
        "type": "lambda",
        "description": "Callback evaluated once per fetched message with [.message] injected",
        "required": true,
        "mode": "ExecutableLambda",
        "cardinality": "ExactlyOne",
        "role": "Callback",
        "evaluation": "EvalBlock",
        "projection": "Self"
      }
    }
  }
}