sending mail from gmail

Question

Hii, i am facing the following error while sending the mail following is my code please help    “The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.   thanks in advance    -----------------------------------------------------------------------------------------------   protected void btnSubmit_Click( object sender, EventArgs e) { try { MailMessage Msg = new MailMessage (); // Sender e-mail address. Msg.From = new MailAddress (txtUsername.Text); // Recipient e-mail address. Msg.To.Add(txtTo.Text); Msg.Subject = txtSubject.Text; Msg.Body = txtBody.Text; // your remote SMTP server IP. SmtpClient smtp = new SmtpClient (); smtp.Host = "smtp.gmail.com" ; smtp.Port = 587; smtp.Credentials= new System.Net. NetworkCredential (txtUsername.Text,txtpwd.Text); smtp.EnableSsl = true ; smtp.Send(Msg); Msg = null ; Page.RegisterStartupScript( "UserMsg" , " alert('Mail sent thank you...');if(alert){ window.location='SendMail.aspx';} " ); } catch ( Exception ex) { Console .WriteLine( "{0} Exception caught." , ex); } } -----------------------------------------------------------------------------------------------------------

Ranjit Powar · Accepted Answer

http://www.aspsnippets.com/Articles/GMAIL-Error-The-SMTP-server-requires-a-secure-connection-or-the-client-was-not-authenticated.aspx

Ananth G · Answer

Hi Friends, Below i give dynamic code for sending mail with Html format. i give sample HTML mail format. you will change that html format based on your requirement Two way to send mail . Use your gmail Id and password. Use SmtpClient URL and Port Number. I give Both two Way If you haveSmtpClient URL and Port Number then you enable#region Not_Have_SmtpClient code else#region Have_SmtpClient code private static string FunForMailSending() { //IF You don't have SmtpClient Url and port No then you must give your gmail id and //paswword. SendHtmlFormattedEmail("Your Subject", "From GMAIL MailID", "GMAIL ID Pwd", "To MailID", "Bcc MailID", "CC MailID", FileUploadControlID); } public void SendHtmlFormattedEmail(string objSubject,string objFromMailID, string objPwd, string objToMailID, string objBccMailID, string objCCMailID, FileUpload fuAttachment) { try { MailMessage objMailMsg; objMailMsg = new MailMessage(); objMailMsg.From = new MailAddress(objFromMailID); objMailMsg.Bcc.Add(objBccMailID); objMailMsg.Bcc.Add(objCCMailID); objMailMsg.To.Add(objToMailID); objMailMsg.Subject = objSubject; objMailMsg.Body = FunForHtmlMailFormat("YOUR PRODUCT_ID", "YOUR PRODUCT_CODE"); if (fuAttachment.HasFile) { string stringFileName = System.IO.Path.GetFileName(fuAttachment.PostedFile.FileName); objMailMsg.Attachments.Add(new Attachment(fuAttachment.PostedFile.InputStream, stringFileName)); } #region Have_SmtpClient ////If you did have SmtpClient Url and port means you will used below code else command below //code enable #region Not_Have_SmtpClient code //SmtpClient objSmtpClient = new SmtpClient(objAutomailURL, Convert.ToInt32(objAutomailPort)); //objSmtpClient.Host = objAutomailURL; //objSmtpClient.Port = Convert.ToInt32(objAutomailPort); //objSmtpClient.UseDefaultCredentials = false; //objSmtpClient.Send(objMailMsg); //objSmtpClient.Dispose(); #endregion #region Not_Have_SmtpClient ////If you did not have SmtpClient Url and port means you will used below code else command below code enable #region Have_SmtpClient code SmtpClient objSmtpClient = new SmtpClient("smtp.gmail.com"); objSmtpClient.Port = 587; objSmtpClient.EnableSsl = true; objSmtpClient.UseDefaultCredentials = false; objSmtpClient.DeliveryMethod = SmtpDeliveryMethod.Network; objSmtpClient.Credentials = new System.Net.NetworkCredential(objFromMailID, objPwd); objSmtpClient.Send(objMailMsg); objSmtpClient.Dispose(); #endregion } catch (Exception ex) { throw ex; } } private static string FunForHtmlMailFormat(string objID, string objName) { return " YOUR APPLICATION NAME Dear All, YOUR DESCRIPTION Product Id " + objID + " Product Name " + objName + " Thanking You, YOUR SIGNATURE Please do not reply to this mail - id, It is an automated mail. All rights reserved © YOUR COPY RIGHTS DETAILS 2016. "; }

Rajeesh Menoth · Answer

Hi,   That is related to authentication issue.You can refer my article.   Reference :   https://rajeeshmenoth.wordpress.com/2014/10/01/send-email-from-gmail-with-smtp-authentication-but-got-5-5-1-authentication-required-error/   http://www.c-sharpcorner.com/blogs/smtp-server-requires-a-secure-connection1