CODEWITHSUNDEEP
c#asp.net.netauthenticationgmail
chithra
chithra

Reputation: 21

Sending mail using Gmail - exception "The SMTP server requires a secure connection"

Aim: send mail with random number if user need to reset or forgot password

Till now what i have done is

View

    <form id="form1" runat="server">
Email Address:
<asp:TextBox ID="txtEmail" runat="server" Width="250" />
<br />
<asp:Label ID="lblMessage" runat="server" />
<br />
<asp:Button Text="Send" runat="server" OnClick="Button1_Click" />
</form>

Source code

    protected void Button1_Click(object sender, EventArgs e)
            {
                string username = string.Empty;
                string password = string.Empty;
                string constr = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
                using (SqlConnection con = new SqlConnection(constr))
                {
                    using (SqlCommand cmd = new SqlCommand("SELECT Name, [Password] FROM tbl_Detailstbl WHERE Email_Id = @Email"))
                    {
                        cmd.Parameters.AddWithValue("@Email", txtEmail.Text.Trim());
                        cmd.Connection = con;
                        con.Open();
                        using (SqlDataReader sdr = cmd.ExecuteReader())
                        {
                            if (sdr.Read())
                            {
                                username = sdr["Name"].ToString();
                                password = sdr["Password"].ToString();
                            }
                        }
                        con.Close();
                    }
                }
                if (!string.IsNullOrEmpty(password))
                {
                    MailMessage mm = new MailMessage("[email protected]", txtEmail.Text.Trim());
                    mm.Subject = "Password Recovery";
                    mm.Body = string.Format("Hi {0},<br /><br />Your password is {1}.<br /><br />Thank You.", username, password);
                    mm.IsBodyHtml = true;
                    SmtpClient smtp = new SmtpClient();
                    smtp.Host = "smtp.gmail.com";
                    smtp.EnableSsl = true;
                    NetworkCredential NetworkCred = new NetworkCredential();
                    NetworkCred.UserName = "[email protected]";
                    NetworkCred.Password = "asfsdfg";
                    smtp.UseDefaultCredentials = true;
                    smtp.Credentials = NetworkCred;
                    smtp.Port = 587;
                    smtp.Send(mm);
                    lblMessage.ForeColor = Color.Green;
                    lblMessage.Text = "Password has been sent to your email address.";
                }
                else
                {
                    lblMessage.ForeColor = Color.Red;
                    lblMessage.Text = "This email address does not match our records.";
                }


   }

An exception of type 'System.Net.Mail.SmtpException' occurred in System.dll but was not handled in user code Additional information: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

Please give me a fine solution for this error

Upvotes: 0

Views: 5354

Answers (3)

N venkatesan
N venkatesan

Reputation: 1

Goto https://google.com/settings/security/lesssecureapps

And Turn On "Allow less secure apps: ON"

Upvotes: -1

Marko Juvančič
Marko Juvančič

Reputation: 5890

My code works, but I don't use default credentials.

Here's the complete code:

var addressFrom = new MailAddress("[email protected]");
var smtp = new SmtpClient
        {
            Host = "smtp.gmail.com",
            Port = 587,
            EnableSsl = true,
            DeliveryMethod = SmtpDeliveryMethod.Network,
            UseDefaultCredentials = false,
            Credentials =
                new NetworkCredential(addressFrom.Address, "mypassword")
        };

var message = new MailMessage
        {
            Subject = _sSubject,
            Body = _sMessage,
            From = addressFrom
        };

var sTo = _sRecepients; // comma separated

message.To.Add(sTo);
smtp.Send(message);

Upvotes: 2

mybirthname
mybirthname

Reputation: 18127

There is security setting which you should turn off in your gmail account(for the account to which you send the mail).

Check this LINK

Upvotes: 2

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