邮件发送 利用SMTP

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 1  System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
 2         client.Host = "smtp.qq.com";
 3         client.UseDefaultCredentials = false;
 4         client.Credentials = new System.Net.NetworkCredential("邮箱用户名", "邮箱密码");
 5         client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
 6         System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage("发件人的邮箱", "收件人的邮箱");
 7         message.Subject = "关于XX的处罚决定";
 8         message.Body = "<center>关于XX的处罚决定</center><br/>关于XX的处罚决定关于XX的处罚决定关于XX的处罚决定关于XX的处罚决定";
 9         message.BodyEncoding = Encoding.UTF8;
10         message.IsBodyHtml = true;
11         System.Net.Mail.Attachment m;//附件
12         if (this.FileUpload1.HasFile)
13         {
14             m = new System.Net.Mail.Attachment(this.FileUpload1.PostedFile.FileName);
15             message.Attachments.Add(m);
16         }
17         client.Send(message);