无法从我的 asp.net 应用程序将电子邮件发送到不同的域

Question

我开发了 asp.net 应用程序，它可以向我公司的域发送电子邮件。示例：ex@companydomain.com，但我无法将其发送到任何其他域，例如 ex@gmail.com 或 ex1@hotmail.com。我需要在 smtp 服务器或我的代码中进行更改吗？请告诉我。我对 .net 很陌生。下面是我使用的代码：

        MailMessage Msg = new MailMessage();
        var MailResult = false;

        var EmailUser = RFSvc.Users.Where(u => u.Email == email).SingleOrDefault();
        if (EmailUser != null)
        {

            Msg.From = new MailAddress("noreply@example.com", "Company name");
            Msg.Subject = "Password Recovery";
            Msg.IsBodyHtml = true;
            Msg.Body = "Your User Name is: " + EmailUser.Username + "<br /> Your password is: " + EmailUser.Password;
            Msg.To.Add(email);

            SmtpClient MailClient = new SmtpClient();

            MailClient.UseDefaultCredentials = false;
            MailClient.Host = "mail.example.com";
            MailClient.Port = 25;
            MailClient.Credentials = new NetworkCredential("username","password");
            //ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
            MailClient.EnableSsl = false;

            try
            {
                MailClient.Send(Msg);

                MailResult = true;
            }
            catch (Exception)
            {
            }
        }

Answer 1

您好，您能提供一下您使用的是哪个端口吗？这样我就可以更清楚你卡在哪里了

Gmail SMTP 服务器名称是 smtp.gmail.com，使用发送邮件的端口是 587，并且还使用 NetworkCredential 进行基于密码的身份验证。

作为suggested by Trimantra Software Solution:

try
        {
            MailMessage mail = new MailMessage();
            SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");

            mail.From = new MailAddress("your_email_address@gmail.com");
            mail.To.Add("to_address");
            mail.Subject = "Test Mail";
            mail.Body = "This is for testing SMTP mail from GMAIL";

            SmtpServer.Port = 587;
            SmtpServer.Credentials = new System.Net.NetworkCredential("username", "password");
            SmtpServer.EnableSsl = true;

            SmtpServer.Send(mail);
            MessageBox.Show("mail Send");
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }

希望对你有帮助

Answer 2

我可以从自定义域向 gmail.com 发送邮件，代码如下：

var fromAddress = new MailAddress("example@mydomain.com", "From Name");
var toAddress = new MailAddress("example@gmail.com", "To Name");
const string fromPassword = "password";
const string subject = "Subject";
const string body = "Body";            

MailMessage message = new MailMessage(fromAddress, toAddress);
message.Subject = subject;
message.Body = body;


var smtp = new SmtpClient
{
  Host = "smtp.mydomain.com",
  Port = 25,
  EnableSsl = true,
  DeliveryMethod = SmtpDeliveryMethod.Network,
  UseDefaultCredentials = false,
  Credentials = new NetworkCredential(fromAddress.Address, fromPassword),
  Timeout = 20000
};            

smtp.Send(message);

注意：

如果它仍然不适合您，请联系您的域名注册商或邮件提供商并获取 smtp 邮件设置，或尝试更改端口 465 、 587 ，或尝试一次注释掉 SmtpClientclass 的单个属性检查它是否有效。

参考资料：

1.

2.