带有ASP.net错误5.5.1的SMTP邮件需要身份验证 [英] SMTP Mail with ASP.net Error 5.5.1 Authentication Required

问题描述

早上好，我是使用ASP.net和SMTP Mailer的初学者

Good day, I'm a beginner from using ASP.net and SMTP Mailer

这里是我的问题，当我从本地发送电子邮件时，总是会遇到此错误并在网上搜索并尝试了解决方案，但并没有那么幸运，我希望有人指出我需要什么代码以及我在哪里遇到此错误

Heres my Question, I always encounter this Error when i send email from my local and searched and tried the solutions around the net but not so lucky, I hope someone point out what codes do i need and where i encounter this errror

Message = "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at"

在这里输入我的代码:

protected void btnSendEmail_Click(object sender, EventArgs e)
        {
            // System.Web.Mail.SmtpMail.SmtpServer is obsolete in 2.0
            // System.Net.Mail.SmtpClient is the alternate class for this in 2.0
            SmtpClient smtpClient = new SmtpClient();
            MailMessage message = new MailMessage();

            try
            {
                MailAddress fromAddress = new MailAddress(txtEmail.Value, txtName.Value);
                smtpClient.Credentials = new System.Net.NetworkCredential("myUser@gmail", "password");
                // You can specify the host name or ipaddress of your server
                // Default in IIS will be localhost 
                smtpClient.Host = "smtp.gmail.com";
                smtpClient.EnableSsl = true;
                //Default port will be 25
                smtpClient.Port = 25;
                smtpClient.UseDefaultCredentials = false;
                //From address will be given as a MailAddress Object
                message.From = fromAddress;

                // To address collection of MailAddress
                message.To.Add("[e-mail]");
                message.Subject = txtSubject.Value;

                // CC and BCC optional
                // MailAddressCollection class is used to send the email to various users
                // You can specify Address as new MailAddress("[e-mail]")
                message.CC.Add("[e-mail]");

                // You can specify Address directly as string
                message.Bcc.Add(new MailAddress("[e-mail]"));

                //Body can be Html or text format
                //Specify true if it  is html message
                message.IsBodyHtml = false;

                // Message body content
                message.Body = txtaMessage.Value;
                message.BodyEncoding = System.Text.Encoding.UTF8;
                message.HeadersEncoding = System.Text.Encoding.UTF8;
                // Send SMTP mail
                smtpClient.Send(message);

                lblSuccess.Text = "Email successfully sent.";
            }
            catch (Exception ex)
            {
                lblSuccess.Text = "Send Email Failed.";
            }
        }

推荐答案

尝试使用此参考资料

Try this reference ASP Simple SMTP for C# and VB it helps me a lot for may smtp problem

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