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This is my code:
MailMessage m = new MailMessage(from, to, subject, body);
SmtpClient s = new SmtpClient("...");
s.Send(m);
Only subject and body are user input.
The code’s fine, but it depends on where “subject” and “body” are coming from. If (as you note) they are user-supplied, you want to make sure you are encoding it (HttpServerUtility.HtmlEncode)