How to send mail with gmail that "mail from" different "email account used send"

MailMessage mail = new MailMessage(); 
mail.Subject = "Subject"; 
mail.Body = "Main body goes here";

mail.From = new System.Net.Mail.MailAddress("my_email@gmail.com","My Name"); 
mail.IsBodyHtml = false; 
mail.BodyEncoding = System.Text.Encoding.Unicode; 
mail.SubjectEncoding = System.Text.Encoding.Unicode;
 
mail.To.Add("mailto@yahoo.com");
 
NetworkCredential cred = new NetworkCredential(
"mail_using_send@gmail.com", //from email address of the sending account
"password"); //password of the sending account
 
SmtpClient smtp = new SmtpClient("smtp.gmail.com"); 
smtp.UseDefaultCredentials = false; 
smtp.EnableSsl = true;
 
smtp.Credentials = cred;  
smtp.Port = 587;
 
smtp.Send(mail);