C#System.Net.Mail采用简单邮件传输协议发送邮件

public class EmailHelper
        {
            public static bool SendEmail(string title, string body, string address)
            {
                try
                {
                    MailAddress from = new MailAddress("xxx@xxx.com", "xxx"); //发送源邮箱地址和名称
                    MailAddress to = new MailAddress(address);       //接收者邮箱地址
                    MailMessage message = new MailMessage(from, to);    //新建邮件
                    message.Subject = title;    //邮件标题
                    message.Body = body;      //邮件正文
                    message.IsBodyHtml = true;       //邮件正文格式
                    using (SmtpClient client = new SmtpClient("255.255.255.255", 50))   //服务器和端口号
                    {
                        client.Credentials = new System.Net.NetworkCredential("xxx", "password");   //用户名和密码
                        client.Send(message);
                    }
                    return true;
                }
                catch (Exception)
                {
                    return false;
                }
            }
        }