如何使用System.Net.Mail设置SMTP信封MAIL FROM？

using System.Net.Mail;

// 创建SmtpClient对象
SmtpClient smtpClient = new SmtpClient("smtp.example.com", 587);
smtpClient.Credentials = new NetworkCredential("username", "password");
smtpClient.EnableSsl = true;

// 创建MailMessage对象
MailMessage mailMessage = new MailMessage();
mailMessage.From = new MailAddress("sender@example.com");
mailMessage.To.Add("recipient@example.com");
mailMessage.Subject = "Test Email";
mailMessage.Body = "This is a test email sent using System.Net.Mail.";

// 发送邮件
smtpClient.Send(mailMessage);