diff --git a/src/shared/backend_interface.cc b/src/shared/backend_interface.cc
index 5f77e12..d9b8d01 100644
--- a/src/shared/backend_interface.cc
+++ b/src/shared/backend_interface.cc
@@ -4,7 +4,7 @@
 #include <sstream>
 #include <iomanip>
 #include<stack>
-//#include <curl/curl.h>
+#include <curl/curl.h>
 
 namespace exam_system {
 
@@ -33,15 +33,15 @@ BackendImpl::BackendImpl() {
     email_config_.password = "your_authorization_code";  // 注意：这是授权码，不是登录密码
     email_config_.use_curl = true;
     
-    // 初始化libcurl
-    // curl_global_init(CURL_GLOBAL_DEFAULT);
+    初始化libcurl
+    curl_global_init(CURL_GLOBAL_DEFAULT);
     
     Logger::Log(Logger::Level::INFO, "BackendImpl初始化完成");
 }
 
-// BackendImpl::~BackendImpl() {
-//     // curl_global_cleanup();
-// }
+BackendImpl::~BackendImpl() {
+    curl_global_cleanup();
+}
 
 bool BackendImpl::SendVerificationCode(const std::string& email) {
     if (email.empty() || email.find('@') == std::string::npos) {
@@ -339,82 +339,82 @@ bool BackendImpl::SendEmail(const std::string& recipient,
 bool BackendImpl::SendEmailViaCurl(const std::string& recipient,
                                   const std::string& subject,
                                   const std::string& body) {
-    // CURL* curl;
-    // CURLcode res = CURLE_OK;
-    // struct curl_slist* recipients = nullptr;
-    // std::string response_string;
-    
-    // curl = curl_easy_init();
-    // if (!curl) {
-    //     Logger::Log(Logger::Level::ERROR, "libcurl初始化失败");
-    //     return false;
-    // }
-    
-    // // 设置SMTP服务器
-    // curl_easy_setopt(curl, CURLOPT_URL, ("smtp://" + email_config_.smtp_server + ":" + std::to_string(email_config_.smtp_port)).c_str());
-    
-    // // 设置用户名和密码
-    // curl_easy_setopt(curl, CURLOPT_USERNAME, email_config_.username.c_str());
-    // curl_easy_setopt(curl, CURLOPT_PASSWORD, email_config_.password.c_str());
-    
-    // // 设置发件人和收件人
-    // curl_easy_setopt(curl, CURLOPT_MAIL_FROM, email_config_.username.c_str());
-    // recipients = curl_slist_append(recipients, recipient.c_str());
-    // curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
-    
-    // // 设置邮件内容
-    // std::string email_data = 
-    //     "To: " + recipient + "\r\n"
-    //     "From: " + email_config_.username + "\r\n"
-    //     "Subject: " + subject + "\r\n"
-    //     "\r\n" + body + "\r\n";
-    
-    // curl_easy_setopt(curl, CURLOPT_READFUNCTION, [](char* buffer, size_t size, size_t nitems, void* instream) -> size_t {
-    //     std::string* email_data = static_cast<std::string*>(instream);
-    //     size_t buffer_size = size * nitems;
+    CURL* curl;
+    CURLcode res = CURLE_OK;
+    struct curl_slist* recipients = nullptr;
+    std::string response_string;
+    
+    curl = curl_easy_init();
+    if (!curl) {
+        Logger::Log(Logger::Level::ERROR, "libcurl初始化失败");
+        return false;
+    }
+    
+    // 设置SMTP服务器
+    curl_easy_setopt(curl, CURLOPT_URL, ("smtp://" + email_config_.smtp_server + ":" + std::to_string(email_config_.smtp_port)).c_str());
+    
+    // 设置用户名和密码
+    curl_easy_setopt(curl, CURLOPT_USERNAME, email_config_.username.c_str());
+    curl_easy_setopt(curl, CURLOPT_PASSWORD, email_config_.password.c_str());
+    
+    // 设置发件人和收件人
+    curl_easy_setopt(curl, CURLOPT_MAIL_FROM, email_config_.username.c_str());
+    recipients = curl_slist_append(recipients, recipient.c_str());
+    curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
+    
+    // 设置邮件内容
+    std::string email_data = 
+        "To: " + recipient + "\r\n"
+        "From: " + email_config_.username + "\r\n"
+        "Subject: " + subject + "\r\n"
+        "\r\n" + body + "\r\n";
+    
+    curl_easy_setopt(curl, CURLOPT_READFUNCTION, [](char* buffer, size_t size, size_t nitems, void* instream) -> size_t {
+        std::string* email_data = static_cast<std::string*>(instream);
+        size_t buffer_size = size * nitems;
         
-    //     if (email_data->empty()) {
-    //         return 0;
-    //     }
+        if (email_data->empty()) {
+            return 0;
+        }
         
-    //     size_t copy_size = std::min(buffer_size, email_data->size());
-    //     memcpy(buffer, email_data->c_str(), copy_size);
-    //     email_data->erase(0, copy_size);
+        size_t copy_size = std::min(buffer_size, email_data->size());
+        memcpy(buffer, email_data->c_str(), copy_size);
+        email_data->erase(0, copy_size);
         
-    //     return copy_size;
-    // });
+        return copy_size;
+    });
     
-    // curl_easy_setopt(curl, CURLOPT_READDATA, &email_data);
-    // curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+    curl_easy_setopt(curl, CURLOPT_READDATA, &email_data);
+    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
     
-    // // 启用TLS
-    // curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
+    // 启用TLS
+    curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
     
-    // // 设置服务器证书验证（生产环境应该设为1）
-    // curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
-    // curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
+    // 设置服务器证书验证（生产环境应该设为1）
+    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
+    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
     
-    // // 设置响应回调
-    // curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
-    // curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response_string);
+    // 设置响应回调
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response_string);
     
-    // // 设置超时
-    // curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30L);
+    // 设置超时
+    curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30L);
     
-    // // 发送邮件
-    // res = curl_easy_perform(curl);
+    // 发送邮件
+    res = curl_easy_perform(curl);
     
-    // // 清理
-    // curl_slist_free_all(recipients);
-    // curl_easy_cleanup(curl);
+    // 清理
+    curl_slist_free_all(recipients);
+    curl_easy_cleanup(curl);
     
-    // if (res != CURLE_OK) {
-    //     Logger::Log(Logger::Level::ERROR, 
-    //                "邮件发送失败: " + std::string(curl_easy_strerror(res)));
-    //     return false;
-    // }
+    if (res != CURLE_OK) {
+        Logger::Log(Logger::Level::ERROR, 
+                   "邮件发送失败: " + std::string(curl_easy_strerror(res)));
+        return false;
+    }
     
-    // Logger::Log(Logger::Level::INFO, "邮件发送成功: " + recipient);
+    Logger::Log(Logger::Level::INFO, "邮件发送成功: " + recipient);
     return true;
 }