Sending email from asp.net using Gmail SMTP OAUTH [duplicate]

Question

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

And getting the exception like below

please suggest me how can I solve this issue.

Thanks in advance.

Tried that proposed solution by doing turn off the "less secure apps" option from my gmail account it's giving same exception like I have mentioned above. — Sagar
– Sagar, Commented Feb 4, 2017 at 11:16

Cyber Progs · Accepted Answer · 2017-02-04 11:57:28Z

3

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: https://www.google.com/settings/u/1/security/lesssecureapps

edited Feb 4, 2017 at 11:57

Cyber Progs

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answered Feb 4, 2017 at 10:42

Chintan Udeshi

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4 Comments

Sagar Over a year ago

Thanks for your suggestion. Yes it's working fine.But I have one more doubt by turning on less secure apps option won't it cause any security issues. Is is secured now?

Chintan Udeshi Over a year ago

It will not raise any security issues. There is another way , you can create App in Gmail and use that App for sending emails.

Sagar Over a year ago

Could you please give your suggestions to do that?

Chintan Udeshi Over a year ago

check out this link emailarchitect.net/easendmail/sdk/html/object_oauth.htm let me know if you have any further query

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