Email Mailbox issue

.NET
1

Hey,

Can anyone tell me what this error means:

Mailbox unavailable. The server response was: 5.7.1 <recruitment@kidsunlimited.com>… Relaying denied. IP name lookup failed [89.187.101.76]

I am trying to send emails with this code:


                    MailMessage message = new MailMessage("recruitment@kidsunlimited.com", txt_email.Text);
                    message.Subject = "Your Apprenticeship application has been submitted.";
                    message.IsBodyHtml = true;
                    message.Body = "Thank you for applying for this role, we will review your application and get back to you as soon as possible.";
                    SmtpClient client = new SmtpClient("cust3512-1.in.mailcontrol.com");
                    client.Send(message);

But when i try sending i keep getting that error, any ideas?

Thanks

2

Sounds like a SMTP setup issue. How is the permissions setup? It seems that, that account does not have the required permissions

3

If i use this:


MailMessage message = new MailMessage("enquiries@kidsunlimited.co.uk", "enquiries@kidsunlimited.co.uk");

The email sends perfectly, but when i change it to this:


MailMessage message = new MailMessage("recruitment@kidsunlimited.co.uk", txt_email.Text);

It gives me the error… Any ideas what this might be?

Also another thing i have noticed is when i change it to this:


MailMessage message = new MailMessage(txt_email.Text, "recruitment@kidsunlimited.co.uk");

It doesn’t seem to give any errors but it does not work how i want it to work. I need the email to send to txt_email.Text.

Why am i having this issue?

Thanks