C#邮件验证（用指定邮箱给另外的邮箱发邮件）

private void button1_Click(object sender, EventArgs e)

{

//发信人和收信人以及内容

MailMessage msg = new MailMessage();

msg.Body = this.richTextBox1.Text;

msg.Subject = this.textBox2.Text;

msg.From = new MailAddress("anxin591025@163.com");

msg.To.Add(this.textBox1.Text);//发送到哪儿

msg.IsBodyHtml = true;

msg.Attachments.Add(new Attachment(textBox3.Text));

//服务器

SmtpClient client = new SmtpClient();

client.Host = "smtp.163.com";//发件方服务器地址

client.Port = 25;//可以省略 端口

//证书的设置

NetworkCredential credential = new NetworkCredential();

credential.UserName = "anxin591025";

credential.Password = "";

client.Credentials = credential;

client.Send(msg);

}

private void button2_Click(object sender, EventArgs e)

{

OpenFileDialog op = new OpenFileDialog();

//op.ShowDialog();

if(System.Windows.Forms.DialogResult.OK==op.ShowDialog())

textBox3.Text = op.FileName;

}