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Error Geting The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. My code as
C#
protected void Button1_Click(object sender, EventArgs e)
   {
       MailMessage mail = new MailMessage();
       SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
       mail.From = new MailAddress("mirajmishra1992@gmail.com");
       mail.To.Add(YourEmail.Text.ToString());
       mail.Subject = YourName.Text.ToString();
       mail.Body = Comments.Text.ToString();
       SmtpServer.Port = 587;
       SmtpServer.Credentials = new System.Net.NetworkCredential("RajnishMishra", "computer");
       SmtpServer.EnableSsl = true;
       SmtpServer.Send(mail);
      // MessageBox.Show("mail Send");
  }
Posted
Updated 21-Nov-14 19:07pm
v3

http://www.codeproject.com/Answers/273383/sendind-mail-using-smtp-in-asp-net#answer2
 
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Solution:

a) go to gmail security center via this link blow or google search for “gmail secrity” and login with your gmail account
https://accounts.google.com/ServiceLogin?elo=1

b) next to “security” / “Recent activity” , click to “view all events”

c) You will able to see “Unusual Activity” , it will show all unusual activity events, select related event and approval it via click ” Yes, That was me!”


// Click allow access to your Google account

d) https://accounts.google.com/DisplayUnlockCaptcha[^]
 
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v3
using (MailMessage mm = new MailMessage("from email", "To email")
               {

                   StreamReader reader = new StreamReader(System.Web.HttpContext.Current.Server.MapPath("~/HtmlPage.html"));
                   string readFile = reader.ReadToEnd();
                   string myString = "";
                   myString = readFile;
                   string fname=dttemp.Rows[0][1].ToString();
                   myString = myString.Replace("$$fname$$", fname);
                   mm.Subject = "Your Subject";
                   mm.Body = myString.ToString();
                   mm.IsBodyHtml = true;
                   SmtpClient smtp = new SmtpClient();
                   smtp.Host = "smtp.gmail.com";
                   smtp.EnableSsl = true;
                   NetworkCredential NetworkCred = new NetworkCredential("from Email", "From Password");
                   smtp.UseDefaultCredentials = false;
                   smtp.Credentials = NetworkCred;
                   smtp.Port = 587;
                   smtp.Send(mm);

               }
 
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