sending email failed in .net when using google smtp server

Question

I am trying to send email like this

var fromAddress = new MailAddress("fromaddress", "From Name");
        var toAddress = new MailAddress("toaddress", "To Name");
        const string fromPassword = "password";
        const string subject = "Subject";
        const string body = "Body";

        var smtp = new SmtpClient
        {
            Host = "smtp.gmail.com",
            Port = 587,
            EnableSsl = true,
            DeliveryMethod = SmtpDeliveryMethod.Network,
            UseDefaultCredentials = false,
            Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
        };
        using (var message = new MailMessage(fromAddress, toAddress)
        {
            Subject = subject,
            Body = body
        })
        {
            smtp.Send(message);
        }


        Console.WriteLine("Sent");
        Console.ReadLine();

but it gives this error .

The SMTP server requires a secure connection or the client was not authenticated. 
The server response was: 5.5.1 Authentication Required.

I am sing this code in simple console application on my local host . So whats the issue in my code ?

Update

I changed fromAddress email and it send email successfully . But i don't receive any email in my toAddress email's inbox/Spam .

Are you sure that the username/password combination does indeed work? I see that your implementation is the same as [this answer](http://stackoverflow.com/questions/32260/sending-email-in-net-through-gmail). — scheien, Feb 13 '14 at 18:38
@HOKBONG Yes , when we try this port it simply stuck for few minutes and then timeout — Ancient, Feb 13 '14 at 18:47
It can be a firewall problem. If you have access to that, open port 587 and 465 for outbound connection. — HOKBONG, Feb 13 '14 at 18:51
Well there is no firewall here . There might be some other problem — Ancient, Feb 13 '14 at 18:59

score 1 · Answer 1 · edited May 23 '17 at 10:33

1

Try to add DeliveryMethod = SmtpDeliveryMethod.Network when creating SmtpClient.

See post: https://stackoverflow.com/a/489594/1432770

There is a variety of reasons for this discussed here: Sending email through Gmail SMTP server with C#

Your code in the first link has worked for me.

edited May 23 '17 at 10:33

Community

1
1

answered Feb 13 '14 at 18:37

George Philip

704
6
21

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if you see my question . I do have this – Ancient Feb 13 '14 at 18:39
yeah but i searched alot and almost tries all of them . Thats why i came here to ask – Ancient Feb 13 '14 at 18:42
Even the application specific password explained in the post? (Direct link : http://stackoverflow.com/a/9572958/1432770) – George Philip Feb 13 '14 at 18:42

score 0 · Answer 2 · answered Feb 13 '14 at 18:41

0

Do you use two steps verification? You need to sign in using application-specific passwords: https://support.google.com/accounts/answer/185833?hl=en

Your code worked for me too!

answered Feb 13 '14 at 18:41

Akira Yamamoto

4,685
4
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sending email failed in .net when using google smtp server

2 Answers2