Sagar Sagar - 4 years ago 178
ASP.NET (C#) Question

Sending email from using Gmail SMTP OAUTH

I just want to implement one sample mail sending application.
I have done lot of research for this. From all the corners I am getting same kind of solution. But that is not working for me.I am unable to find my mistake. I am using below code

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.EnableSsl = true;
NetworkCredential NetworkCred = new NetworkCredential(txtEmail.Text, txtPassword.Text);
smtp.UseDefaultCredentials = true;
smtp.Credentials = NetworkCred;
smtp.Port = 587;
ClientScript.RegisterStartupScript(GetType(), "alert", "alert('Email sent.');", true);

And getting the exception like below

enter image description here

please suggest me how can I solve this issue.

Thanks in advance.

Answer Source

Assuming that you are using a correct Gmail credentials for the account with which you are sending emails. You need to turn on "less secure apps" setting using the below link:

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