C#•2y ago

Error with app send email

The goal is to make a send emails app from c# , later on to also send with attachments but im stuck at this for the past 2 hours As you can see in the image its saying the error is on line 52 Here is what i have done till now: line 52 is the line smpt.Send(msg);

private void btnEnviar_Click(object sender, EventArgs e)
        {
            try
            {
                //Criar duas string s que contenham o email e a password

                string from = "myemailinfo";
                string password = "mypasswordhere";

                //Criar o objeto de acesso ah class mail
                MailMessage msg = new MailMessage();
                msg.Subject = txtAssunto.Text;
                msg.From = new MailAddress(from);
                msg.Body = txtMensagem.Text;
                msg.To.Add(new MailAddress(cmbEmail.Text));

                SmtpClient smpt = new SmtpClient();

                smpt.Host = "smpt.gmail.com";

                smpt.Port = 587;

                smpt.UseDefaultCredentials = false;

                smpt.EnableSsl = true;

                NetworkCredential nc = new NetworkCredential(from, password);

                smpt.Credentials = nc;

                smpt.Send(msg);

                MessageBox.Show("Email Enviado com sucesso!");
            }   
            catch(Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

private void btnEnviar_Click(object sender, EventArgs e)
        {
            try
            {
                //Criar duas string s que contenham o email e a password

                string from = "myemailinfo";
                string password = "mypasswordhere";

                //Criar o objeto de acesso ah class mail
                MailMessage msg = new MailMessage();
                msg.Subject = txtAssunto.Text;
                msg.From = new MailAddress(from);
                msg.Body = txtMensagem.Text;
                msg.To.Add(new MailAddress(cmbEmail.Text));

                SmtpClient smpt = new SmtpClient();

                smpt.Host = "smpt.gmail.com";

                smpt.Port = 587;

                smpt.UseDefaultCredentials = false;

                smpt.EnableSsl = true;

                NetworkCredential nc = new NetworkCredential(from, password);

                smpt.Credentials = nc;

                smpt.Send(msg);

                MessageBox.Show("Email Enviado com sucesso!");
            }   
            catch(Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

Can someone help me why is it saying this?

18 Replies

Sossenbinder•2y ago

Are you sure smpt.gmail is right? Shouldn't it be smtp? Yeah it should DNS Resolution is your issue since smpt.gmail.com is not a thing nslookup is your friend 😄

yumo•2y ago

yeah it was wrong but it was a variable so that wouldnt solve the problem i changed all the smpt to smtp and is saying the same still

Sossenbinder•2y ago

Did you correct this line? smpt.Host = "smpt.gmail.com";

yumo•2y ago

its saying that the server SMTP needs one safe connection or the client its not authenticated

yumo•2y ago

after i corrected that its showing me the error above

Sossenbinder•2y ago

Okay, now you're running into an authentication issue So the domain is now properly resolved You might want to look up whether your authentication procedure is correctly implemented But it's one step forward from the last issue

yumo•2y ago

i have the correct data, is it possible to be because im sendind an email to myself? how can i make it to send to hotmail to

Sossenbinder•2y ago

It's been a while since I worked with it, but I think if you are working with username & password instead of oauth for authentication, you need to enable "Less secure apps" in your gmail account That might be your issue https://myaccount.google.com/lesssecureapps

yumo•2y ago

didnt they remove that option some months ago? i will check

Sossenbinder•2y ago

Not sure, as I said, it's been a while since I used that

yumo•2y ago

yeah its not available again "This setting is no longer available."

Sossenbinder•2y ago

Hmm, I see

Sossenbinder•2y ago

https://wpmailsmtp.com/gmail-less-secure-apps/

WP Mail SMTP

Gmail Is Disabling Less Secure Apps: What To Do Next