// C# 示例代码
public async Task SendEmailUsingWebApi(string serviceUrl, string accessToken)
{
    using (HttpClient client = new HttpClient())
    {
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        
        // 创建电子邮件实体
        var email = new
        {
            subject = "测试邮件主题",
            description = "这是邮件正文内容",
            directioncode = true, // true 表示外发邮件
            prioritycode = 1, // 1=高优先级
            from = new[] { new { partyid_systemuser@odata.bind = "/systemusers(用户GUID)" } },
            to = new[] { new { partyid_contact@odata.bind = "/contacts(联系人GUID)" } }
        };
        
        string requestUrl = $"{serviceUrl}/api/data/v9.1/emails";
        var response = await client.PostAsJsonAsync(requestUrl, email);
        
        if (response.IsSuccessStatusCode)
        {
            // 发送邮件
            var emailId = JObject.Parse(await response.Content.ReadAsStringAsync())["emailid"].ToString();
            var sendRequest = new
            {
                EmailId = emailId,
                IssueSend = true,
                TrackingToken = ""
            };
            
            requestUrl = $"{serviceUrl}/api/data/v9.1/SendEmail";
            response = await client.PostAsJsonAsync(requestUrl, sendRequest);
        }
    }
}

// JavaScript 示例
async function sendEmailFromTemplate(serviceUrl, accessToken) {
    const headers = {
        "Authorization": `Bearer ${accessToken}`,
        "Accept": "application/json",
        "Content-Type": "application/json",
        "OData-MaxVersion": "4.0",
        "OData-Version": "4.0"
    };
    
    // 创建使用模板的邮件
    const emailData = {
        "email_activity_parties": [
            {
                "partyid_systemuser@odata.bind": "/systemusers(用户GUID)",
                "participationtypemask": 1 // 发件人
            },
            {
                "partyid_contact@odata.bind": "/contacts(联系人GUID)",
                "participationtypemask": 2 // 收件人
            }
        ],
        "template@odata.bind": "/templates(模板GUID)",
        "regardingobjectid_account@odata.bind": "/accounts(相关客户GUID)"
    };
    
    const response = await fetch(`${serviceUrl}/api/data/v9.1/emails`, {
        method: "POST",
        headers: headers,
        body: JSON.stringify(emailData)
    });
    
    if (response.ok) {
        const email = await response.json();
        const sendResponse = await fetch(`${serviceUrl}/api/data/v9.1/SendEmail`, {
            method: "POST",
            headers: headers,
            body: JSON.stringify({
                EmailId: email.emailid,
                IssueSend: true
            })
        });
    }
}