Question

可能重复：
How can I lower the spam score of my email message?

我有这个可以向人们发送大量电子邮件的c＃代码。但是我发送的电子邮件已归类为垃圾邮件。我应该怎么办。是否有任何更改我应该应用于我的代码？我尝试从sql server数据库获取电子邮件地址。我的代码可以附加一个文件。

Entities context = new Entities();
var query = from c in context.Emails select c.EmailAddress;
MailMessage mail = new MailMessage();
Regex sample = new Regex(@"^[-!#$%&'*+/0-9=?A-Z^_a-z{|}~](\.?[-!#$%&'*+/0-9=?A-Z^_a-z{|}~])*
                                  @[a-zA-Z](-?[a-zA-Z0-9])*(\.[a-zA-Z](-?[a-zA-Z0-9])*)+$");
int total = 0;//number of all emails
int count = 0;//counter for putting interrupt between each 10 sending
int failed = 0;//number of failed sending
int success = 0;//number of successful sending

double totalsize = 0;//size of attachment file

if (FileUpload1.HasFile)
{
    mail.Attachments.Add(new Attachment(FileUpload1.PostedFile.InputStream, FileUpload1.FileName));
    foreach (Attachment attachment in mail.Attachments)
    {
        string size =attachment.ContentStream.Length.ToString ();
        totalsize=Convert .ToDouble (size);
    }
 }
foreach (var c in query)
{
    if (count == 10)
    {
        Thread.Sleep(10000);
        count = 0;
    }
    mail.From = new MailAddress("hadi@myhost.com");
    mail.Bcc.Add(new MailAddress(c.ToString()));
    mail.Subject = "hello";
    mail.IsBodyHtml = true;

    mail.Body = FCKeditor1.Value.ToString();

    SmtpClient smtp = new SmtpClient();
    smtp.Host = "localhost";
    smtp.Port = 25; 
    if ((sample.IsMatch(c.ToString())) && (sample .IsMatch (mail .From .ToString ())) && (totalsize<1000000))
    {
      try
        {
            smtp.Send(mail);
            //Response.Write("email has sent to " + c.ToString());
            success++;

        }
        catch 
        {
            //Response.Write("email has not sent to " + c.ToString());
            failed++;
        }
        count++;
    }
    total++;
}

Answer 1

您无需对代码执行任何操作即可使其成为垃圾邮件。您所要做的就是确保您从不应该有“开放接力”的主机发送电子邮件，这意味着不是每个人都可以发送电子邮件。

从适当的服务器发送电子邮件并使用正确的电子邮件签名，以便在接收方检查身份验证时，他们应验证您的电子邮件来源服务器以及从您的电子邮件主机验证的签名。

如何保护在asp.net中将已发送的电子邮件分类为垃圾邮件

1 个答案: