I am creating a C# application that once a day send an email to my personal email.
This is the code:

SmtpClient mySmtpClient = new SmtpClient("host", 25);
mySmtpClient.Credentials = new System.Net.NetworkCredential("username", "psw");
mySmtpClient.Send(message);

However I need an SMTP server to do that.
Are there any free online smpt servers for doing that?