CODEWITHSUNDEEP
c#emailasp.net-coresmtpmailkit
Gaurav_0093
Gaurav_0093

Reputation: 1020

The SMTP server has unexpectedly disconnected in MailKit

I am using mailkit to send a mail in ASP.NET Core Here is my code

var emailMessage = new MimeMessage();

emailMessage.From.Add(new MailboxAddress("Gorrolo", "[email protected]"));
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:54850";
    await client.ConnectAsync("smtp.gmail.com", 465, false);
    client.Authenticate("Myemail", "Mypassword");
    client.Send(emailMessage);
    //await client.emailMessage(emailMessage).ConfigureAwait(false);
    //await client.DisconnectAsync(true).ConfigureAwait(false);
}

in the line

await client.ConnectAsync("smtp.gmail.com", 465, false)

Debugger sowing the following error The SMTP server has unexpectedly disconnected

Upvotes: 3

Views: 12249

Answers (2)

snisman
snisman

Reputation: 1

One of the reasons that this error is received on the 'SmtpClient' while trying to send a message is whenever some of the recipient 'MailboxAddress' (To, Cc, Bcc) is set to an empty string. See details https://github.com/jstedfast/MailKit/issues/866

Upvotes: 0

tolsen64
tolsen64

Reputation: 999

This is what works for me in 2021

void SendGmail(MimeMessage mm)
{
    mm.From.Add(new MailboxAddress("The Email Service", "[email protected]"));
    using SmtpClient client = new(new ProtocolLogger("smtp.log"));
    client.ServerCertificateValidationCallback = (s, c, h, e) => true;
    client.Connect("smtp.gmail.com", 587, SecureSocketOptions.StartTls);
    client.Authenticate("[email protected]", "My$uperSecr3tPa55w0rd"); // app password
    client.Send(mm);
    client.Disconnect(true);
}

Upvotes: 1

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