红帽全球峰会33.8. 多个接收者以便更轻松地配置
可以使用逗号或分号分隔的列表来设置多个接收者。这同时适用于标头设置，也适用于端点 URI 中的设置。例如：
Map<String, Object> headers = new HashMap<String, Object>();
headers.put("to", "davsclaus@apache.org ; jstrachan@apache.org ; ningjiang@apache.org");
前面的示例使用分号 ; 作为分隔符字符。
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