首先要导入jmail.dll 

#import "jmail.dll"

还要初始化COM套间

CoInitialize(NULL);

调用代码如下

 typedef HRESULT (__stdcall* pfnDllGetClassObject)(REFCLSID, REFIID, void**);

 HINSTANCE hDllInst = LoadLibrary(_T("jmail.dll"));

 pfnDllGetClassObject fnDllGetClassObject = (pfnDllGetClassObject)GetProcAddress(hDllInst, "DllGetClassObject");

 if (fnDllGetClassObject != NULL)
 {
  IClassFactory* lpClassFactory = NULL;

  HRESULT hr = (fnDllGetClassObject)(__uuidof(jmail::Message), IID_IClassFactory, (void**)&lpClassFactory);

  if (SUCCEEDED(hr) && (lpClassFactory != NULL))
  {
   IUnknown* lpUnknown = NULL;

   hr = lpClassFactory->CreateInstance(NULL, __uuidof(jmail::IMessage), (void**)&lpUnknown);

   if (SUCCEEDED(hr) && (lpUnknown != NULL))
   {
    jmail::IMessagePtr MyMessage(lpUnknown);

    //不抛出错误
    MyMessage->PutSilent(VARIANT_TRUE);

    MyMessage->PutISOEncodeHeaders(VARIANT_TRUE);

    //字符集，缺省为"US-ASCII"
    MyMessage->PutCharset(_T("GB2312"));
    
    //发件人姓名
    MyMessage->PutFromName(_T("test"));
    
    //发件人邮箱
    MyMessage->PutFrom(_T("***@***.com"));

    //发件人邮件用户名
    MyMessage->PutMailServerUserName(_T("***"));

    //发件人邮件密码
    MyMessage->PutMailServerPassWord(_T("***"));

    //设置邮件标题
    MyMessage->PutSubject(_T("邮件标题"));

    //邮件内容
    MyMessage->PutBody(_T("邮件内容"));

    //发送对象  
    MyMessage->AddRecipient(_T("***@***.com"), _T(""), _T(""));

    //Jmail发送的方法
    MyMessage->Send(_T("smtp.***.com"), VARIANT_FALSE);

    MyMessage->Close();

    MyMessage.Release();
   }

   lpClassFactory->Release();
  }
 }

 FreeLibrary(hDllInst);