如何解决电子邮件发送中的错误 [英] how to solve the error in email sending

问题描述

我出现错误
SMTP服务器需要安全连接，或者客户端未通过身份验证.服务器响应为:5.7.0必须首先发出STARTTLS命令. kr4sm12198444pbc.76
durin发送电子邮件


.cs

i hv a error
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. kr4sm12198444pbc.76
durin sending email


.cs

NetworkCredential nt = new NetworkCredential("*************@gmail.com", "12345678");
                   string usermail = ds.Tables[0].Rows[0][0].ToString();
                   string passwd = ds.Tables[0].Rows[0][1].ToString();
                   MailMessage mail = new MailMessage();
                   SmtpClient smtp = new SmtpClient();
                   smtp.Credentials = nt;
                   mail.From = new MailAddress(Text2.Value);
                   mail.To.Add(new MailAddress(usermail));
                   mail.IsBodyHtml = true;
                   mail.Subject = "Password";
                   mail.Body = "Your password is : " + passwd + "";
                   smtp.Host = "smtp.gmail.com";
                   smtp.Port = 587;
                   smtp.Send(mail);//here is error
                   lbl.Visible = true;
                   lbl.Text = "password sent successfully";
                   mail.To.Clear();
                   mail.Dispose();

我该怎么办....

what should i do....

推荐答案

private void MailSendThruGmail()
    {
        MailAddress fromAddress = new MailAddress("[e-mail]", "From Name");
        MailAddress toAddress = new MailAddress("[e-mail]", "To Name");
        const string subject = "test";
        const string body = @"Using this feature, you can send an e-mail message from an application very easily.";

        System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage(fromAddress.Address, toAddress.Address, subject, body);
        msg.IsBodyHtml = true;

        var client = new SmtpClient("smtp.gmail.com", 587)
        {
            Credentials = new NetworkCredential("username", "password"),
            EnableSsl = true
        };

        try
        {
            client.Send(msg);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
    }

请不要使用Gmail进行测试.使用免费的本地电子邮件服务器，例如HmailServer.

Please do not use Gmail for testing. Use your own local email server, like HmailServer, which is free.

MailMessage message = new MailMessage();



            message.From = new MailAddress("[e-mail]");

            message.To.Add(new MailAddress("[e-mail]"));

            message.Subject = subject.Text;

            message.Body = body.Text;



            SmtpClient client = new SmtpClient();

            client.Credentials = new System.Net.NetworkCredential("[e-mail]", "password");



            client.Port = 587;

            client.Host = "smtp.gmail.com";

            client.EnableSsl = true;

            try

            {

                client.Send(message);

            }

            catch (Exception ex)

            {

                System.Windows.Forms.MessageBox.Show(ex.Message);

            }

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