电子邮件发送失败，我没有收到Cofirnation电子邮件ASP.NET

Question

try
        {
            MailMessage mail = new MailMessage();
            mail.To.Add(UserName.Text);
            mail.From = new MailAddress("[e-mail]");
            mail.Subject = "Varificarion Code";
            string Body = "Hello";
            mail.Body = Body;
            mail.IsBodyHtml = true;
            SmtpClient smtp = new SmtpClient();
            smtp.Host = "smtp.gmail.com";
            smtp.Port = 587;
            smtp.UseDefaultCredentials = false;
            smtp.Credentials = new System.Net.NetworkCredential("[e-mail]", "shammus123");// Enter senders User name and password
            smtp.EnableSsl = true;
            smtp.Send(mail);
            return true;
        }
        catch (Exception ex)
        {
            string str = ex.ToString();
            return false;
        }

例外：" SMTP服务器需要安全的连接或未对客户端进行身份验证。服务器响应是：5.5.1认证。在"

"上了解更多信息。

我想向用户发送变量邮件。

Answer 1

尝试这个;

1- 将这些名称空间添加到您的项目;

使用System.net.mail;

使用System.net;

2- 使用此代码短语;

    MailMessage mail = new MailMessage();
    mail.IsBodyHtml = true;
    mail.To.Add(UserName.Text.ToString());
    mail.From = new MailAddress("[e-mail]", "Hello", System.Text.Encoding.UTF8);
    mail.Subject = "Verification Code";
    string Mesaj = "Hello";
    mail.Body = Mesaj;
    SmtpClient smtp = new SmtpClient();
    smtp.Credentials = new NetworkCredential("[e-mail]", "shammus123");
    smtp.Port = 587;
    smtp.Host = "smtp.gmail.com";
    smtp.EnableSsl = true;
    if (UserName.Text.ToString() != string.Empty)
    {
        smtp.Send(mail);
    }