SMTP服务器在MailKit中意外断开连接

Question

我正在使用mailkit在asp.net core中发送邮件这是我的代码

var emailMessage = new MimeMessage();
emailMessage.From.Add(new MailboxAddress("Gorrolo", "[e-mail]"));
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);
}

在行中

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

调试器播种以下错误 SMTP服务器意外断开

Answer 1

这是2021年对我有用的

void SendGmail(MimeMessage mm)
{
    mm.From.Add(new MailboxAddress("The Email Service", "[e-mail]"));
    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("[e-mail]", "My$uperSecr3tPa55w0rd"); // app password
    client.Send(mm);
    client.Disconnect(true);
}

Answer 2

试图发送消息时在'smtpclient'上收到此错误的原因之一是每当某些收件人'MailboxAddress'(to，cc，bcc(设置为一个空字符串。请参阅详细信息https://github.com/jstedfast/mailkit/issues/866