只要有 Gmail 個人帳號與密碼，透過 Gmail SMTP SSL 的認證，Gmail 就可以幫助你寄信囉！
該程式利用 MailAddress 建立收發信人的郵件位址，MailMessage 建立郵件相關內容，SmtpClient 與 NetworkCredential 建立 Smtp 連線認證與寄信功能。
程式碼：
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using System;
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using System.ComponentModel;
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using System.Net;
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using System.Net.Mail;
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using System.Text;
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using System.Windows.Forms;
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namespace MyMail
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{
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public partial class Form1 : Form
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{
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public Form1( )
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{
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InitializeComponent( );
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}
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private void button1_Click_1( object sender, EventArgs e)
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{
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// Mail Message Setting
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string fromEmail = "XXX@gmail.com";
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string fromName = "C.H.Huang";
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MailAddress from = new MailAddress (fromEmail, fromName, Encoding. UTF8 );
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string toEmail = "YYY@gmail.com";
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MailMessage mail = new MailMessage (from, new MailAddress (toEmail ) );
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string subject = "Test Subject";
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mail.Subject = subject;
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mail.SubjectEncoding = Encoding.UTF8;
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string body = "Test Body";
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mail.Body = body;
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mail.BodyEncoding = Encoding.UTF8;
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mail.IsBodyHtml = false;
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mail.Priority = MailPriority.High;
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// SMTP Setting
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SmtpClient client = new SmtpClient ( );
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client.Host = "smtp.gmail.com";
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client.Port = 587;
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client. Credentials = new NetworkCredential ( "username@gmail.com", "password" );
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client.EnableSsl = true;
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// Send Mail
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client.SendAsync (mail, mail);
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// Sent Compeleted Eevet
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client. SendCompleted += new SendCompletedEventHandler (client_SendCompleted );
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}
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// Handle Sent Compeleted Eevet
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private void client_SendCompleted( object sender, AsyncCompletedEventArgs e)
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{
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if (e.Error != null )
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{
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MessageBox.Show (e.Error.ToString ( ) );
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}
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else
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{
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MessageBox.Show ( "Message sent." );
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}
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}
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}
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}
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