MailMessage+SmtpClient 发送邮件

private static void SendMail(string to, string from,string content)
{
string subject="Mail Title";//邮件标题
string strSmtpServer= "smtp.163.com";//服务器
string strSmtpUserName = "登录账号@163.com";//登录用户
string strSmtpUserPwd = "登录密码";//登录密码
if (string.IsNullOrEmpty(to)) return;

MailMessage mail = new MailMessage(from, to, subject, content); //创建邮件信息
if (File.Exists("D:/login.png"))
{
Attachment attach=new Attachment("D:/login.png"); //添加附件
//FileStream file = new FileStream("D:/login.png", FileMode.Open);
//Attachment attachStream = new Attachment(file, "login.png"); //通过文件流添加附件
mail.Attachments.Add(attach);
}

SmtpClient client = new SmtpClient(strSmtpServer); //创建SMTP客户端
try
{
client.Credentials = new System.Net.NetworkCredential(strSmtpUserName, strSmtpUserPwd);//登录客户端
client.Send(mail);//发送邮件  邮件发送方必须和登录用户一致
}
catch (Exception)
{

}
}