在 asp.net 中通过 C# 发送电子邮件

Question

下面是我从我的邮箱发送电子邮件的代码，但我收到了一个错误，请帮忙！

Error: Email not sent!System.Net.Mail.SmtpException: The operation has timed out. at System.Net.Mail.SmtpClient.Send(MailMessage message) at _Default.Button1_Click(Object sender, EventArgs e)

try{

        MailMessage mailmessage = new MailMessage();
        mailmessage.To.Add(TextBox3.Text);
        mailmessage.From=new MailAddress("sadiazar05@gmail.com");
        mailmessage.Subject = "User SignUp";
        mailmessage.Body = "Hello You're registered!";
        SmtpClient smtpclient = new SmtpClient("smtp.gmail.com",465);
        mailmessage.Priority = MailPriority.High;
        smtpclient.Timeout = 60000;
        smtpclient.Send(mailmessage);
        Response.Write("Email sent successfully!");
        }
        catch(Exception exp)
        {
            Response.Write("Email not sent!" +exp);
        }
    }

Answer 1

您可以尝试使用25端口，如果不行您可以尝试587端口：

SmtpClient smtpclient = new SmtpClient("smtp.gmail.com",The Other Port);

Answer 2

尝试this code并启用 SSL。

SmtpClient client = new SmtpClient("smtp.gmail.com", 587);           
 client.EnableSsl = true;
 MailAddress from = new MailAddress("YourGmailUserName@gmail.com", "[ Your full name here]");           
 MailAddress to = new MailAddress("your recipient e-mail address", "Your recepient name");
 MailMessage message = new MailMessage(from, to);
 message.Body = "This is a test e-mail message sent using gmail as a relay server ";
 message.Subject = "Gmail test email with SSL and Credentials";
 NetworkCredential myCreds = new NetworkCredential("YourGmailUserName@gmail.com", "YourPassword", "");           
 client.Credentials = myCreds;
 client.Send(message);

Answer 3

你可以这样试试：

try{
    // message details
    MailMessage mailmessage = new MailMessage();
    mailmessage.To.Add(TextBox3.Text);
    mailmessage.From=new MailAddress("sadiazar05@gmail.com");
    mailmessage.Subject = "User SignUp";
    mailmessage.Body = "Hello You're registered!";      
    mailmessage.Priority = MailPriority.High;
    //smtp Client details
    smtpclient.UseDefaultCredentials = False
    smtpclient.Credentials = New Net.NetworkCredential("email", "password")// here you have to give your username and password
    smtpclient.Port = 587 // default port for gmail
    smtpclient.EnableSsl = True
    smtpclient.Host = "smtp.gmail.com"
    smtpclient.Timeout = 60000;
    smtpclient.Send(mailmessage);
    Response.Write("Email sent successfully!");
    }
    catch(Exception exp)
    {
        Response.Write("Email not sent!" +exp);
    }
}

Answer 4

587 是 Gmail 端口

smtpclient.Port = 587

SMTP 默认使用 TCP 端口 25。邮件提交协议相同，但使用端口 587。受 SSL 保护的 SMTP 连接，称为 SMTPS，默认使用端口 465（非标准，但有时出于遗留原因使用).

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