Email Sending Error ..

Karthik K

9y1.5k.NET

Hi ,

I had a issue while i develop the Email sending , i Am facing the problem..in the below code Kindly Help me out .

Code sample :

protected void SendEmail(object sender, EventArgs e)

{

string to = txtTo.Text;

string from = txtEmail.Text;

string subject = txtSubject.Text;

string body = txtBody.Text;

using (MailMessage mm = new MailMessage(txtEmail.Text, txtTo.Text))

{

mm.Subject = txtSubject.Text;

mm.Body = txtBody.Text;

if (fuAttachment.HasFile)

{

string FileName = Path.GetFileName(fuAttachment.PostedFile.FileName);

mm.Attachments.Add(new Attachment(fuAttachment.PostedFile.InputStream, FileName));

}

mm.IsBodyHtml = false;

SmtpClient smtp = new SmtpClient();

smtp.Host = "Smtp.gmail.com";

smtp.EnableSsl = true;

NetworkCredential NetworkCred = new NetworkCredential(txtEmail.Text, txtPassword.Text);

smtp.UseDefaultCredentials = true;

smtp.Credentials = NetworkCred;

smtp.Port = 587;

smtp.Send(mm); In this like Error is occured

ClientScript.RegisterStartupScript(GetType(), "alert", "alert('Email sent.');", true);

}

Error :

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

If possible , Guid me properly , with the appropriate change .

Thanks in advance

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Amit Gupta9y ago
Accepted answer
Hey

There are 2 possibilities

1. If you are sending email from gmail, you MUST allow less secure app to ON in yout gmail setting at
https://myaccount.google.com/security

2. If you are accessing your gmail from remote location, google will send you an email that your email has been used somewhere else, just allow signin from that email, so that your app can send email without any problem.

The same has been answered on the below link
http://www.c-sharpcorner.com/forums/how-to-sent-mail-using-smtp-config

Good luck !!
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Rupesh Kahane9y ago
Please refer code from below artice

1) http://www.c-sharpcorner.com/UploadFile/a8024d/send-event-invitation-emails-using-mvc-5-with-code-first-app/

Very Important: If you are going to use a gmail account then make sure that your account Access for less secure app is ON because we are going to send direct email from our code.

All the best.
0
Khaja Moizuddin9y ago
Check these links https://forums.asp.net/t/1723410.aspx?Page+ClientScript+RegisterStartupScript+opens+OutLook+but+can+not+see+the+Outlookt+ https://stackoverflow.com/questions/25860975/send-email-through-asp-net-web-api https://www.aspsnippets.com/Articles/How-to-send-email-Asynchronously-in-ASPNet-using-Background-Thread.aspx https://www.codeproject.com/Questions/1079450/How-to-send-mail-in-asp-net https://www.codeproject.com/Questions/1079450/How-to-send-mail-in-asp-net https://codewala.net/2011/11/24/page-clientscript-registerstartupscript-is-not-working/ http://www.c-sharpcorner.com/UploadFile/sourabh_mishra1/sending-an-e-mail-with-attachment-using-Asp-Net/
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