使用 Exchange Web 服务托管 API 检索最大发送邮件大小限制

Question

我一直在寻找一些方法来使用 EWS 托管 API 来检索最大邮件大小限制以进行发送，但没有找到任何可行的解决方案...

到目前为止，我发现了这个链接：https://docs.microsoft.com/en-us/exchange/client-developer/exchange-web-services/how-to-get-service-configuration-information-by-using-ews-in-exchange#code-example-get-service-configuration-information-for-mail-tips-by-using-ews

这基本上检索邮件提示中的最大邮件大小。但问题是，当我尝试代码时，我收到了 500 内部服务器错误。而且似乎没有办法直接使用托管 API 本身来执行此操作。

非常感谢任何帮助。

谢谢！

Answer 1

Microsoft 示例中存在一个错误，他们已将 SOAP 命名空间从 http 修改为 https。可能有些编辑认为他们在不了解 XML 模式如何工作的情况下做正确的事情。但是一个工作样本是

        private static void GetServiceConfiguration()
    {
        // XML for the GetServiceConfiguration request SOAP envelope for mail tips configuration information.
        const string getServiceConfigurationRequest =
          "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" +
          "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n" +
          "               xmlns:m=\"http://schemas.microsoft.com/exchange/services/2006/messages\"\n" +
          "               xmlns:t=\"http://schemas.microsoft.com/exchange/services/2006/types\" \n" +
          "               xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\"\n" +
          "               xmlns:xs=\"http://www.w3.org/2001/XMLSchema\">\n" +
          "  <soap:Header>\n" +
          "    <t:RequestServerVersion Version=\"Exchange2013\" />\n" +
          "  </soap:Header>\n" +
          "  <soap:Body>\n" +
          "    <m:GetServiceConfiguration>\n" +
          "      <m:ActingAs>\n" +
          "        <t:EmailAddress>user@domain.com</t:EmailAddress>\n" +
          "        <t:RoutingType>SMTP</t:RoutingType>\n" +
          "      </m:ActingAs>\n" +
          "      <m:RequestedConfiguration>\n" +
          "        <m:ConfigurationName>MailTips</m:ConfigurationName>\n" +
          "      </m:RequestedConfiguration>\n" +
          "    </m:GetServiceConfiguration>\n" +
          "  </soap:Body>\n" +
          "</soap:Envelope>";
        // Encoded GetServiceConfiguration operation request.
        byte[] payload = System.Text.Encoding.UTF8.GetBytes(getServiceConfigurationRequest);
        try
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://outlook.office365.com/ews/exchange.asmx");
            request.AllowAutoRedirect = false;
            request.Credentials = new NetworkCredential("user@domain.com", "blah");
            request.Method = "POST";
            request.ContentType = "text/xml";
            request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36";
            Stream requestStream = request.GetRequestStream();
            requestStream.Write(payload, 0, payload.Length);
            requestStream.Close();

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                Stream responseStream = response.GetResponseStream();
                StreamReader reader = new StreamReader(responseStream);
                string responseFromServer = reader.ReadToEnd();
                Console.WriteLine("You will need to parse this response to get the configuration information:\n\n" + responseFromServer);
                reader.Close();
                responseStream.Close();
            }
            else
                throw new WebException(response.StatusDescription);

        }
        catch (WebException e)
        {
            Console.WriteLine(e.Message);
        }

我还添加了一个用户代理，因为如果设置了用户代理限制，这有时也会导致代码失败。但是，如果您对 Office365 使用此功能，您也应该切换到使用 OAuth。