asp.net code for gmail mail sending

Question

net code for sending mail via Gmail is not working did everything like less secure apps turned on, powerful password, with and without app password, with and without two-step verification.

coding:-

{
    var fromAddress = new MailAddress("doctor@gmail.com");    
    var fromPassword = "idntcare";        
    var toAddress = new MailAddress("thevarghese@gmail.com");    
    string subject = "subject";    
    string body = "body";    
    System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient
    {
         Host = "smtp.gmail.com",
         Port = 587,
         EnableSsl = true,
         DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network,
         UseDefaultCredentials = false,
         Credentials = new NetworkCredential(fromAddress.Address, fromPassword)

    };

    using (var message = new MailMessage(fromAddress, toAddress)
    {
         Subject = subject,
         Body = body
    })    
    smtp.Send(message);    
}

What do you mean by "it's not working"? What is the problem ? What exception dou yo have? Also I see 2 problems in your code: You forget the `;` after the using code. You CANNOT use `message` outside the `using` block. — Rumpelstinsk, May 23 '17 at 05:52
using(var message ...........) once this is executed gets disposed. So, smtp.Send(message) can not send disposed message. — Bhuban Shrestha, May 23 '17 at 05:53
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. — Vargiz, May 23 '17 at 05:59

score 2 · Answer 1 · answered May 23 '17 at 05:57

2

Try doing this

using (var message = new MailMessage(fromAddress, toAddress)
{
     Subject = subject,
     Body = body
     smtp.Send(message);
})

Or try this

using (MailMessage mm = new MailMessage(from, emailTo))
{
    var mailAddress = new MailAddress("address", "name for id");
    mm.From = mailAddress;
    mm.Subject = title;
    mm.Body = HttpUtility.HtmlDecode(body);
    mm.IsBodyHtml = true;
    SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
    smtp.EnableSsl = true;
    NetworkCredential NetworkCred = new NetworkCredential(from, password);
    smtp.UseDefaultCredentials = false;
    smtp.Credentials = NetworkCred;
    smtp.Send(mm);
}

answered May 23 '17 at 05:57

Aditya Korti

692
2
12
28

am getting the same error : The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required – Vargiz May 23 '17 at 06:10
https://stackoverflow.com/questions/20906077/gmail-error-the-smtp-server-requires-a-secure-connection-or-the-client-was-not – Aditya Korti May 23 '17 at 06:13

score 1 · Answer 2 · answered May 23 '17 at 05:58

1

try this.

MailMessage Msg = new MailMessage();
// Sender e-mail address.
Msg.From = new MailAddress("doctor@gmail.com");
// Recipient e-mail address.
Msg.To.Add("thevarghese@gmail.com");
Msg.Subject ="subject";
Msg.Body = "body";
// your remote SMTP server IP.
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.Port = 587;
smtp.Credentials=new System.Net.NetworkCredential("user name","password");
smtp.EnableSsl = true;
smtp.Send(Msg);

answered May 23 '17 at 05:58

SynozeN Technologies

1,337
1
14
19

am getting the same error : The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required – Vargiz May 23 '17 at 06:09
I didn't get why it's not working for you. follow this link. https://stackoverflow.com/questions/20906077/gmail-error-the-smtp-server-requires-a-secure-connection-or-the-client-was-not – SynozeN Technologies May 23 '17 at 06:12

score 1 · Answer 3 · answered May 23 '17 at 06:04

string fromAddress ="doctor@gmail.com";    
string fromPassword = "idntcare";        
string toAddress = "thevarghese@gmail.com"; 
using (MailMessage mm = new MailMessage(fromAddress, toAddress))
    {
        mm.Subject = subject;
        mm.Body = body;

        //attachment
        if (fuAttachment.HasFile)
        {
            string FileName = Path.GetFileName(fuAttachment.PostedFile.FileName);
            mm.Attachments.Add(new Attachment(fuAttachment.PostedFile.InputStream, FileName));
        }
        mm.IsBodyHtml = true;

        System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient();

        smtp.Host = "smtp.gmail.com";
        smtp.EnableSsl = true;

        NetworkCredential NetworkCred = new NetworkCredential(email, password);
        smtp.UseDefaultCredentials = true;
        smtp.Credentials = NetworkCred;
        smtp.Port = 587;
        //smtp.Port = 25;
        smtp.Send(mm);
        ClientScript.RegisterStartupScript(GetType(), "alert", "alert('Email sent.');", true);
    }

Try These, you can use port number 587 or 25.

am getting the same error : The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required — Vargiz, May 23 '17 at 06:10
yes, you need to change some setting in gmail which u use to sent (fromAddress). — Hanni, May 23 '17 at 06:13
check this link https://galleryserverpro.com/use-gmail-as-your-smtp-server-even-when-using-2-factor-authentication-2-step-verification/ — Hanni, May 23 '17 at 06:23

asp.net code for gmail mail sending

3 Answers3