Instead of using the To.Add
method, you can pass a comma separated list of email address to MailMessage
constructor which is a much better solution especially if you have more than a few email addresses to send the email to...
var from = "me@me.com";
var to = "mail1@domain.com,mail2@domain.com,mail3@domain.com";
var subject = "My Subject";
var body = "Message Body";
var message = new MailMessage(from, to, subject, body);
will work just as well...