c# MimeKit 邮件未正确发送。 System.Net.Mail 工作正常

Question

我制作了一个控制台应用程序来测试 MimeKit，它的执行没有错误，但电子邮件从未到达。

我使用与 System.Net.Mail 相同的数据，一切正常。

可能是什么问题？

MimeKit 代码：

            var email = new MimeMessage();
            email.Sender = MailboxAddress.Parse("aa@sbb.com");
            email.To.Add(MailboxAddress.Parse("aa.cc@dd.com"));
            email.To.Add(MailboxAddress.Parse("bb.dd@dd.com"));
            email.Subject = "test";
            var builder = new BodyBuilder();

            builder.HtmlBody = "corpo";
            email.Body = builder.ToMessageBody();


            using var smtp = new SmtpClient();
            smtp.Connect("smtp.xxx.com", 25, SecureSocketOptions.None);
            smtp.Authenticate("ut", "pwd");
            smtp.SendAsync(email);
            smtp.Disconnect(true);

            Console.WriteLine("Email Sent.");

System.mail代码：

using (MailMessage mm = new MailMessage())
            {
                mm.To.Add(new MailAddress("aa.cc@dd.com"));
                mm.To.Add(new MailAddress("bb.dd@dd.com"));
                mm.From = new MailAddress("aa@sbb.com", "You");
                mm.ReplyToList.Add("aa@sbb.com");
                mm.Subject = "vecchia mail";
                mm.Body = "con system.mail";
                mm.IsBodyHtml = false;

                SmtpClient smtp = new SmtpClient();
                smtp.Host = "smtp.xxx.com";
                smtp.EnableSsl = false;
                smtp.UseDefaultCredentials = false;
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                NetworkCredential NetworkCred = new NetworkCredential("ut", "pwd");
                smtp.Credentials = NetworkCred;
                smtp.Port = 25;
                Console.WriteLine("Sending Email......");
                smtp.Send(mm);
                Console.WriteLine("Email Sent.");
            }

Answer 1

感谢@Klaus Gütter 我得到了错误然后找到了解决方案：阻止开发机器和邮件服务器之间连接的安全规则，一旦在测试环境中部署应用程序一切正常。

感谢建议

c# MimeKit 邮件未正确发送。 System.Net.Mail 工作正常

c# MimeKit mail not sent without error. System.Net.Mail works fine

c#

email

mailkit

system.net.mail

mimekit