C#發送Email郵件（實例：QQ郵箱和Gmail郵箱）

下面用到的郵件帳號和密碼都不是真實的，須要測試就換成本身的郵件帳號。

須要引用：
using System.Net.Mail;
using System.Text;
using System.Net;

程序代碼：

        MailMessage myMail = new MailMessage(); //建立郵件實例對象

        myMail.From = new MailAddress(""); //發送者，要和郵件服務器的驗證信息對應，不能隨便更改
       
        myMail.To.Add(new MailAddress("")); //接收者

        myMail.Subject = "C#發送Email"; //郵件標題
        myMail.SubjectEncoding = Encoding.UTF8; //標題編碼

        myMail.Body = "this is a test email!"; //郵件內容
        myMail.BodyEncoding = Encoding.UTF8; //郵件內容編碼
        myMail.IsBodyHtml = true;     //郵件內容是否支持html

        SmtpClient smtp = new SmtpClient(); //建立smtp實例對象
        smtp.Host = "mail.sina.com"; //郵件服務器SMTP
        smtp.Port = 25;                  //郵件服務器端口
        smtp.Credentials = new NetworkCredential("", "123456"); //郵件服務器驗證信息

        smtp.Send(myMail); //發送郵件

使用Gmail郵箱發送郵件示例

        MailMessage myMail = new MailMessage();

        myMail.From = new MailAddress("");
        myMail.To.Add(new MailAddress(""));

        myMail.Subject = "C#發送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鏈接

        smtp.DeliveryMethod = SmtpDeliveryMethod.Network; //Gmail的發送方式是經過網絡的方式，須要指定

        smtp.Send(myMail);

使用QQ郵箱發送郵件示例

        MailMessage myMail = new MailMessage();

        myMail.From = new MailAddress("");
        myMail.To.Add(new MailAddress(""));

        myMail.Subject = "C#發送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);