Question

我处于一种奇怪的境地。当我从localhost发送电子邮件时它工作正常但是当我将页面上传到服务器并尝试发送电子邮件时，我收到以下错误

SMTP服务器需要安全连接，或者客户端未经过身份验证。服务器响应为：5.5.1需要身份验证

我正在标签中显示错误消息以供测试，而且我也知道，尝试也是错误的，我会稍后再设置。

我正在使用的代码是

 if (Page.IsValid)
    {
try
            {
            StringBuilder message = new StringBuilder();
            message.Append("Hello My Name is ");
            message.Append(txtName.Text);
            message.AppendLine();
            message.AppendLine("My Contact Number " + txtContactNumber.Text.ToString());
            message.AppendLine();
            message.AppendLine();
            message.AppendLine("My Email Id Is " + txtFromEmailAddress.Text.ToString());
            message.AppendLine();
            message.Append(txtEmailBody.Text);


        MailMessage mailMessage = new MailMessage("xxx@gmail.com", "yyy@gmail.com");
        mailMessage.Subject = "New Client Query";
        mailMessage.Body = message.ToString();

        SmtpClient smtpClient = new SmtpClient("smtp.gmail.com", 25);
        //smtpClient.UseDefaultCredentials = true;
        smtpClient.Credentials = new System.Net.NetworkCredential()
        {
            UserName = "xxx@gmail.com",
            Password = "password"
        };
        smtpClient.EnableSsl = true;

            smtpClient.Send(mailMessage);


        txtContactNumber.Text = "";
        txtFromEmailAddress.Text = "";
        txtName.Text = "";
        txtEmailBody.Text = "";
        lblEmailStatus.Text = "Email Sent Successfully.";
        lblEmailStatus.ForeColor = System.Drawing.Color.Yellow; 
        }
        catch(Exception ex)
        {
            lblEmailStatus.Text = ex.Message + " <br> " + ex.Source;
        }
    }
    else
    {

        lblEmailStatus.Text = "Error!   Email Not Sent ";
        lblEmailStatus.ForeColor = System.Drawing.Color.Yellow;
    }

我已经谷歌搜索了几个小时，并检查了这个网站的链接，但我仍然无法弄明白。

现在我要求你们这里有任何人有任何解决方案/提示。

Answer 1

试试这个

    public string SendEmailTest(String EmailMessage, String FromMail, String MailPassword, String MailServer, String To, String CC, String BCC, String DisplayName, String Subject, String Attachment)
    {
        try
        {
            SmtpClient smtpClient = new SmtpClient();

            MailMessage message = new MailMessage();

            MailAddress fromAddress;

            fromAddress = new MailAddress(FromMail);

            smtpClient.Host = MailServer;
            smtpClient.Port = 25;

            System.Net.NetworkCredential SMTPUserInfo = new System.Net.NetworkCredential(FromMail, MailPassword);
            smtpClient.UseDefaultCredentials = false;
            smtpClient.Credentials = SMTPUserInfo;

            message.From = fromAddress;

            message.To.Add(new MailAddress(To, DisplayName));
            if (CC != "")
                message.CC.Add(new MailAddress(CC, DisplayName));
            if (BCC != "")
                message.Bcc.Add(new MailAddress(BCC, DisplayName));

            message.Subject = Subject;

            message.IsBodyHtml = true;
            message.Body = EmailMessage;

            if (Attachment != "")
                message.Attachments.Add(new Attachment(Attachment));

            message.Priority = MailPriority.High;

            smtpClient.Send(message);
            return "SendEmail";
        }
        catch (Exception ex)
        {
            return "Email :" + ex;
        }

    }

Answer 2

我终于得到了理由。

我发送电子邮件的电子邮件在几天前就被黑客攻击了，出于安全原因，谷歌团队将我的电子邮件标记为不安全。我改变了电子邮件地址，它很好，谢谢大家。

Answer 3

基于Google Gmail Documentation，端口应该是587而不是25.我发现了一些似乎与here和here相关的其他问题。

SmtpClient smtpClient = new SmtpClient("smtp.gmail.com", 587);
client.UseDefaultCredentials = false;

无法从我的网站发送电子邮件

3 个答案: