无法更改“邮件”中实际发件人的“发件人”地址属性

我很难更改实际发件人地址的"From"属性值，即使我将其添加到代码中，如下所示：(不要介意添加的内容 From 标头显示我的地址，我连接到 SMTP 服务器(

MailMessage m = new MailMessage(); 
SmtpClient sc = new SmtpClient();
m.From = new MailAddress(from, "Display name From"); 
m.To.Add(new MailAddress(to, "Display name To"));
m.Subject = "Test1"; 
m.IsBodyHtml = true; 
m.Body = " This is a Test Mail";
m.ReplyTo = new MailAddress(from);
MailAddress bcc = new MailAddress(to);
m.Bcc.Add(bcc);
sc.Host = "smtp.gmail.com"; 
sc.Port = 587;
sc.Credentials = new System.Net.NetworkCredential("google@gmail.com", "password");
sc.EnableSsl = true;
sc.Send(m);

如果有人能帮助我解决这个问题，我将不胜感激