{
    "to": {
        "emails": [
            "word@bgjkcsqy.wecom.work",
            "jyan1@tiyantest.wang"   
        ],
        "userids": [
            "william"
        ]
    },
    "cc": {
        "emails": [],
        "userids": ["panyy"]
    },
    "bcc": {
        "emails": ["zoro@bgjkcsqy.wecom.work"],
        "userids": []
    },
    "subject": "这是标题",
    "content": "这是邮件正文",
    "attachment_list": [
        {
            "file_name": "a.txt",
            "content": "BASE64_CONTENT"
        }
    ],
    "enable_id_trans":1
}

$departmentName=DEPARTMENT_ID$
$userName=USERID$
$userAlias=USERID$
$userAliasOrName=USERID$

{
    "errcode": 0,
    "errmsg": "ok"
}