一个发送邮件的简单程序

SmtpClient mailClient = new SmtpClient();
mailClient.Host = "smtp.qq.com";

//Credentials登陆SMTP服务器的身份验证.
mailClient.Credentials = new NetworkCredential("[e-mail]", "123123123");

//通过network发送至smtp服务器
mailClient.DeliveryMethod = SmtpDeliveryMethod.Network;

//[e-mail] 发件人地址、[e-mail]收件人地址
MailMessage message = new MailMessage(new MailAddress("[e-mail]"),new MailAddress("[e-mail]"));
message.Body = "Hello Word!";// 邮件内容
message.Subject = "this is a test";//邮件主题

//发送....
try
{
    mailClient.Send(message);
}
catch (Exception ex)
{
    MessageBox.Show("邮件发送不成功，原因：" + ex);
}

 

上述代码能实现邮件的简单发送功能，需要注意的以下几点：

1.发件人的邮件必须开通smtp功能，否则程序会出异常，通常会显示mail from address must be ths same as authorization user

2.发件人地址不存在时，他会在认证时出现need EHLO and AUTH first异常