C#发送Email邮件（实例：QQ邮箱和Gmail邮箱）

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下面用到的邮件账号和密码都不是真实的，需要测试就换成自己的邮件账号。   需要引用： using System.Net.Mail; using System.Text; using System.Net;   程序代码：           MailMessage myMail = new MailMessage(); //创建邮件实例对象           myMail.From = new MailAddress(""); //发送者，要和邮件服务器的验证信息对应，不能随便更改                  myMail.To.Add(new MailAddress("")); //接收者           myMail.Subject = "C#发送Email"; //邮件标题         myMail.SubjectEncoding = Encoding.UTF8; //标题编码           myMail.Body = "this is a test email!"; //邮件内容         myMail.BodyEncoding = Encoding.UTF8; //邮件内容编码         myMail.IsBodyHtml = true;     //邮件内容是否支持html           SmtpClient smtp = new SmtpClient(); //创建smtp实例对象         smtp.Host = "mail.sina.com"; //邮件服务器SMTP         smtp.Port = 25;                  //邮件服务器端口         smtp.Credentials = new NetworkCredential("", "123456"); //邮件服务器验证信息           smtp.Send(myMail); //发送邮件   使用Gmail邮箱发送邮件示例           MailMessage myMail = new MailMessage();           myMail.From = new MailAddress("");         myMail.To.Add(new MailAddress(""));           myMail.Subject = "C#发送Email";         myMail.SubjectEncoding = Encoding.UTF8;           myMail.Body = "this is a test email from gmail!<a href='http://www.sina.com.cn'>sina</a>";         myMail.BodyEncoding = Encoding.UTF8;         myMail.IsBodyHtml = true;           SmtpClient smtp = new SmtpClient();         smtp.Host = "smtp.gmail.com";         smtp.Port = 587; //Gmail的smtp端口         smtp.Credentials = new NetworkCredential("", "123456");         smtp.EnableSsl = true; //Gmail要求SSL连接           smtp.DeliveryMethod = SmtpDeliveryMethod.Network; //Gmail的发送方式是通过网络的方式，需要指定           smtp.Send(myMail);   使用QQ邮箱发送邮件示例           MailMessage myMail = new MailMessage();           myMail.From = new MailAddress("");         myMail.To.Add(new MailAddress(""));           myMail.Subject = "C#发送Email";         myMail.SubjectEncoding = Encoding.UTF8;           myMail.Body = "this is a test email from QQ!";         myMail.BodyEncoding = Encoding.UTF8;         myMail.IsBodyHtml = true;           SmtpClient smtp = new SmtpClient();         smtp.Host = "smtp.qq.com";         smtp.Credentials = new NetworkCredential("", "123456");           smtp.Send(myMail);