Trying to send SMTP email - connection refused

Question

I am trying to send an email to MailTrap.io its a free smtp portal for checking the email but im getting the following error.

I am using MailKit to send the email

https://mailtrap.io

 public async Task SendEmailAsync(string email, string subject, string message)
 {
        try
        {
            var emailMessage = new MimeMessage();

            emailMessage.From.Add(new MailboxAddress("David", "davidnoreply@gmail.com"));
            emailMessage.To.Add(new MailboxAddress("", email));
            emailMessage.Subject = subject;
            emailMessage.Body = new TextPart("HTML") { Text = message };

            using (var client = new SmtpClient())
            {
                client.LocalDomain = "http://localhost:52101";
                await client.ConnectAsync("smtp.mailtrap.io", 584, true);
                client.Authenticate("16729fdfa173b4", "0e6de61c67b069");
                client.Send(emailMessage);
                //await client.emailMessage(emailMessage).ConfigureAwait(false);
                //await client.DisconnectAsync(true).ConfigureAwait(false);
            }

        }
        catch (Exception ex)
        {
            // TODO: handle exception
            throw new InvalidOperationException(ex.Message);
        }
    }

But the following error presents itself I have tried on port 25 but then i get an error about ssl.

No connection could be made because the target machine actively refused it. 127.0.0.1:25

If I change it to port 25 I get the following.

An error occurred while attempting to establish an SSL or TLS connection.

This usually means that the SSL certificate presented by the server is not trusted by the system for one or more of
the following reasons:

1. The server is using a self-signed certificate which cannot be verified.
2. The local system is missing a Root or Intermediate certificate needed to verify the server's certificate.
3. A Certificate Authority CRL server for one or more of the certificates in the chain is temporarily unavailable.
4. The certificate presented by the server is expired or invalid.

Another possibility is that you are trying to connect to a port which does not support SSL/TLS.

It is also possible that the set of SSL/TLS protocols supported by the client and server do not match.

See https://github.com/jstedfast/MailKit/blob/master/FAQ.md#SslHandshakeException for possible solutions.

Edit 2

I removed the ssl but stil the same error above.

public async Task SendEmailAsync(string email, string subject, string message)
{
        try
        {
            var emailMessage = new MimeMessage();

            emailMessage.From.Add(new MailboxAddress("David", "david@gmail.com"));
            emailMessage.To.Add(new MailboxAddress("", email));
            emailMessage.Subject = subject;
            emailMessage.Body = new TextPart("HTML") { Text = message };

            using (var client = new SmtpClient())
            {

                await client.ConnectAsync("smtp.mailtrap.io", 25, true);
                client.Authenticate("16729fdfa173b4", "0e6de61c67b069");
                client.Send(emailMessage);
                //await client.emailMessage(emailMessage).ConfigureAwait(false);
                //await client.DisconnectAsync(true).ConfigureAwait(false);
            }

        }
        catch (Exception ex)
        {
            // TODO: handle exception
            throw new InvalidOperationException(ex.Message);
        }
}

The error message makes it look like you're trying to connect to your own computer. — itsme86, May 19 '20 at 15:39
No I removed the code client.LocalDomain = "http://localhost:52101"; and changed the port to 25 but its given me the second error @PabloCG — c-sharp-and-swiftui-devni, May 19 '20 at 15:40
You specified `useSsl = true` in `ConnectAsync`. What happens when you set it to `false`? — Lucas S., May 19 '20 at 15:42
Is the port for smtp.mailtrap.io correct? They should indicate how to connect to them correctly. — Pablo CG, May 19 '20 at 15:43
I remove that please see edits above ! Yes Port is correct SMTP Host: smtp.mailtrap.io Port: 25 or 465 or 587 or 2525 — c-sharp-and-swiftui-devni, May 19 '20 at 15:43
Have you tried to telnet into any of the ports, e.g. `telnet smtp.mailtrap.io 2525`? If so, do you receive any response? — Bob Mc, May 19 '20 at 16:31

Trying to send SMTP email - connection refused

0 Answers0