CODEWITHSUNDEEP
c#asp.netemail
Ehsan Akbar
Ehsan Akbar

Reputation: 7301

Send email using asp.net shows this error:The SMTP server requires a secure connection or the client was not authenticated

I try to send email using this code:

  public void Semail(string subject, string messageBody, string toAddress)
        {
            MailMessage mail = new MailMessage();
            mail.To.Add(toAddress);
            //mail.To.Add("[email protected]");
            mail.From = new MailAddress("[email protected]");
            mail.Subject = subject;
            string Body = messageBody;
            mail.Body = Body;
            mail.IsBodyHtml = true;
            SmtpClient smtp = new SmtpClient();
            smtp.Host = "sina.sharif.ir"; //Or Your SMTP Server Address
            smtp.Port = 587;
            smtp.Credentials = new System.Net.NetworkCredential
                ("[email protected]", "*******");
            //Or your Smtp Email ID and Password
            smtp.EnableSsl = false;
            smtp.Send(mail);
        }

But after executing i got this error: 

 The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication required

Stack Trace :

[SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication required]
   System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response) +2162008
   System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from) +287
   System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) +137
   System.Net.Mail.SmtpClient.Send(MailMessage message) +2188821
   Novitiate.fa.Register.btnLogin_Click(Object sender, EventArgs e) +2948
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +154
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3707

Best regards

Upvotes: 2

Views: 3547

Answers (3)

danielonsombi
danielonsombi

Reputation: 1

Consider @Krunal Patil's answer there after login to your email account and act on the sent verification mail to grant access to your C# Application.

Upvotes: 0

Sandeep
Sandeep

Reputation: 21

Your gmail security preventing the message to access the gmail account. So,if you want to send the message you have to "turn off" the access for less secure app. When you do this you can easily send the message but, by risking your gmail security. So, it is upto you this definitely work.

link for changing security is given below

https://www.google.com/settings/security/lesssecureapps?pli=1

Upvotes: 2

Krunal Patil
Krunal Patil

Reputation: 3676

Try this one if this helps:

MailMessage mail = new MailMessage();
SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
mail.From = new MailAddress(Username);
mail.To.Add(TxtEmail.Text);
mail.Subject = Subject;
mail.Body = Body;
SmtpServer.Port = 587;
SmtpServer.Credentials = new System.Net.NetworkCredential(Username, Password);
SmtpServer.EnableSsl = true;
SmtpServer.Timeout = 20000;
SmtpServer.Send(mail);

Upvotes: 0

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