The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at

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C#

private void button1_Click(object sender, EventArgs e)
{
   string date = DateTime.Now.ToShortDateString();
   string time = DateTime.Now.ToShortTimeString();
   MailMessage mail = new MailMessage();
   SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
   mail.From = new MailAddress("keylessenc2015@gmail.com");
   mail.To.Add(textBox1.Text);
   mail.Subject = textBox2.Text;
   mail.Body = richTextBox1.Text;

   System.Net.Mail.Attachment attachment;
   attachment = new System.Net.Mail.Attachment(textBox3.Text);
   mail.Attachments.Add(attachment);

   System.Net.Mail.Attachment attachment1;
   attachment1 = new System.Net.Mail.Attachment(textBox4.Text);
   mail.Attachments.Add(attachment1);

   SmtpServer.Port = 587;
   SmtpServer.Credentials = new System.Net.NetworkCredential("keylessenc2015@gmail.com", "******");
   SmtpServer.UseDefaultCredentials = false;
   SmtpServer.EnableSsl = true;
   SmtpServer.Send(mail);
   MessageBox.Show("Mail Send");
   insert(date,time);
}

public void insert(string d,string t)
{
   con.Open();
   SqlCommand cmd = new SqlCommand("insert into [transaction](t_date,t_time,user_s1_email,user_s2_email,user_code) values('" + d + "','" + t + "','" + textBox3.Text + "','" + textBox4.Text + "','" + id+ "')", con);
   cmd.ExecuteNonQuery();
   con.Close();
}

i am getting error in SmtpServer.Send(mail);

Posted 27-Jan-15 23:24pm

Member 11166005

Updated 27-Jan-15 23:55pm

phil.o

v2

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Comments

_Asif_ 28-Jan-15 5:35am

a simple google search will give you hundred of answers

Member 11166005 28-Jan-15 5:38am

can u explain me.i am not getting

_Asif_ 28-Jan-15 5:41am

Try this

https://www.google.com.pk/webhp?sourceid=chrome-instant&rlz=1C1RNZZ___PK587PK587&ion=1&espv=2&ie=UTF-8#q=5.5.1%20authentication%20required

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Sujith Karivelil · Answer 1 · 2015-01-27T23:59:00

This may help you try this :

Try
           Dim Smtp_Server As New SmtpClient
           Dim e_mail As New MailMessage()
           Smtp_Server.UseDefaultCredentials = False
           Smtp_Server.Credentials = New Net.NetworkCredential("email", "password")
           Smtp_Server.Port = 587
           Smtp_Server.EnableSsl = True
           Smtp_Server.Host = "smtp.gmail.com"

           e_mail = New MailMessage()
           e_mail.From = New MailAddress(txtemail.Text)
           e_mail.To.Add(txtemail.Text)
           e_mail.Subject = "Email Sending"
           e_mail.IsBodyHtml = False
           e_mail.Body = txtMessage.Text
           Smtp_Server.Send(e_mail)
           MsgBox("Mail Sent")
       Catch error_t As Exception
           MsgBox(error_t.ToString)
       End Try