try
{
//准备邮件内容
MailMessage message = new MailMessage ("abc@163.com", "abc@163.com", "测试邮件发送", "查看附件 ");
message.Attachments.Add(new Attachment(@"D:\a.txt"));
message.Priority = MailPriority.High;
message.IsBodyHtml = false;
//准备安全凭证
NetworkCredential nc= new NetworkCredential("abc","邮箱密码");
//准备SMTP,发送电子邮件
SmtpClient client = new SmtpClient("smtp.163.com",25);
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.Credentials = nc;
client.Send(message);
MessageBox.Show("邮件发送成功!!");
}
catch (FormatException ex)
{
MessageBox.Show(ex.Message);
}
catch (SmtpException ex)
{
MessageBox.Show(ex.Message);
}