what is rdns

reverse Domain name resolution, in contrast to the usual forward domain resolution, provides IP address to the corresponding domain name. IP Reverse resolution is primarily applied to mail servers to block spam, especially in foreign countries.

Original e-Mail used content-type:text/htmlThe following is the X-spam score, when the score more than 6 points are treated as junk mailX-spam-status:yes, score=6.3 required=6.0 tests=content_type_present,Directunknown,

First, the domain name resolution process1. The browser checks its own cache, and the cache time varies from a few minutes to an hour, determined by setting the TTL property.2. If 1 is not found, check the OS cache, such as the host file under

How to install "CentOS webpage panel" on CentOS"About CentOS webpage panel There are currently many free or paid control panels. Today, we will discuss the CentOS web page Panel (CWP), which is specially designed for RPM-based releases such as

A DN is comprised of a series of RDNs (Relative distinguished Names) found by walking up the tree (DIT) to its root (or Su Ffix or base) and is written left to right unlike the file system analogy you see quoted everywhere which are written right to

Group Strategy Plan 1. Store the email address in a table by domain name and send it according to different policies. 2. traverse the group one to three times to exclude all invalid mailboxes. 3. Set 3-5 recipients for an email to increase the

First, Introduction The REQ directive is used to create and process certificates in the PKCS#10 format Second, the grammar OpenSSL req [-inform pem| DER] [-outform pem| DER] [-infile(s)] [-newkey rsa:bits] [-newkey DSA:file] [-newkey EC:fileID

OpenSSL is an open source SSL implementation. The simplest and most important application based on the OpenSSL directive is to use Req, CAs, and X509 to issue a certificate.OpenSSL provides command-line options and interactive two ways to perform

Work desire good its prerequisite, Firefox has always been the infiltration of the necessary weapon, small series recommended 34 Firefox Penetration Testing Auxiliary plug-in, which contains penetration testing, information collection, agent,

Basic commandsFind out that the shell is not a/sbin/nologin user in all users of the system;cat/etc/passwd | Grep-v "/sbin/nologin"Find the word "a total of 19 letters at the end of a R" in the System dictionary linux.words.Egrep ' ^a[a-z]{17}r$