Sending email appears to work only in domain

Hi,

I am using the following code to generate and send an email:

Code:

        private SmtpClient GetSmtpClient()
        {
            SmtpClient client = new SmtpClient();
            //m06.internetmailserver.net
            client.Host = Properties.Settings.Default.SmtpHost;
            client.UseDefaultCredentials = false;
            // [email protected]
            System.Net.NetworkCredential credential = new System.Net.NetworkCredential(Properties.Settings.Default.UserName, Properties.Settings.Default.Password);
            client.Credentials = credential;
            return client;
        }

Which gets used here ...

Code:

  MailMessage message = new MailMessage();
                message.IsBodyHtml = true;
                message.Body = GetSimpleNotificationTemplate(model);
                message.From = new MailAddress("[email protected]");
                message.To.Add(new MailAddress(model.Email)); 
                message.Subject = "Confirmation";
                var client = GetSmtpClient();
                client.Send(message);

Here is the problem. It only sends to accounts in the postmaster domain. For example, it will send to [email protected], but not to any other domains like hotmail or google. Not sure what's going on. Am I missing something in my mail setup? Any insight appreciated. Thank you

 

Good advice, I opened a new ticket, thank you