سلام
من از لنیکهای (لینک1 و لینک2)  برای ارسال ایمیل کمک گرفتم ولی در آخرین خط ارور میده.

کد :

  //create the mail message 
            MailMessage mail = new MailMessage();

            //set the addresses 
            mail.From = new MailAddress("info@mydomain.com");
            //IMPORTANT: This must be same as your smtp authentication address.
            mail.To.Add("emailto");

            //set the content 
            mail.Subject = "subject";
            mail.Body = "body";
            mail.IsBodyHtml = true;
            //send the message 
            SmtpClient smtp = new SmtpClient("webmail.mydomain.com");

            //IMPORANT:  Your smtp login email MUST be same as your FROM address. 
            NetworkCredential Credentials = new NetworkCredential("info@mydomain.com", "pass");
            smtp.Credentials = Credentials;
            smtp.Send(mail);

ارور :

{"A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 185.159.152.14:25"}

راه حل چیه؟