ssl - Asp.netSendEmail SMTP 服务器要求安全连接或客户端未通过身份验证

Question

我正在使用 google smtp 发送电子邮件。该代码在我的本地机器中正常工作。但是在生产服务器上，我收到的错误消息是 SendEmail The SMTP server requires a secure connection or client was not authenticated。服务器响应是:5.5.1 需要身份验证。了解更多信息

我试过了，client.UseDefaultCredentials = true;将其设置为 false 但它不起作用。

Answer 1

尝试使用此代码通过 Google 发送邮件

            MailMessage oMail = new MailMessage();
            SmtpClient smtpClient = new SmtpClient();
            string FromMailID = "yourgmailid@gmail.com";
            string UserName = "GmailUsername";
            string Password = "GmailPassword";

            MailAddress fromAddress = new MailAddress(FromMailID);
            if (FilePath != "")//If attached file otherwise comment
            {
                Attachment PDFfile = new Attachment(FilePath);
                oMail.Attachments.Add(PDFfile);
            }
            oMail.From = fromAddress;
            oMail.To.Add(ToMailID);
            oMail.Subject = Subject;
            oMail.IsBodyHtml = true;
            oMail.Body = Mailcontent.ToString();
            smtpClient.Host = "smtp.gmail.com";   // We use gmail as our smtp client
            smtpClient.Port = 25;//localhost
            smtpClient.UseDefaultCredentials = false;
            smtpClient.EnableSsl = true;
            smtpClient.UseDefaultCredentials = true;
            smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtpClient.Credentials = new System.Net.NetworkCredential(UserName, Password);

            smtpClient.Send(oMail);