smtp ptr record

Spam in the flood of today, spam to our lives, work, learning has brought great harm. Because of the lack of effective authentication mechanism between SMTP servers, even if the use of spam identification blocking technology is still common, and the

Note: Postfix SMTP authentication needs to be connected to Authdaemon to obtain authentication information through CYRUS-SASL;The limitations and filtering capabilities of Postfix are explained later in this section.First, installation configuration

Postfix Anti-Spam technology-Linux Enterprise Application-Linux server application information. The following is a detailed description. The Anti-Spam function of MTA is to filter sessions during MTA processing. This filter not only filters the Spam

. A recordA record represents the corresponding relationship between host name and IP address, which is to convert the name to an IP addressDNS uses a record to answer "What is the IP address of a host name?" "The host name must be translated into

In the previous blog post we introduced several indispensable records in DNS servers, including a, NS, and SOA records. In this blog post we will continue to introduce several other common DNS records, I hope you can understand the DNS helpful.Four

Now the Internet spam is more and more, if set up your MailServer security settings is an important issue. Now, for example, the most popular MDaemon Mail server, let's discuss the security settings for MDaemon. Recommended reading: MDaemon Use

. 1 Postfix configuration file structure The Postfix configuration file is located in/etc/Postfix. After the Postfix is installed, you can run the LS command to view the Postfix configuration file: [Root @ mail Postfix] # ls Install. Cf main. Cf

4.1postfix configuration file structure the postfix configuration file is located in etcpostfix. After installing the postfix, we can run the ls command to view the postfix configuration file: [root @ mailpostfix] # lsinstall. cfmain. cfmaster.

When sending an email, Postfix uses the system's resolver (that is, the DNS client, which can query domain information from the DNS server) to obtain DNS information. When receiving a mail, the DNS of your domain must provide delivery information

When sending an email,PostfixUse the system's resolver (that isDNSClient, which can query the domain information function library from the DNS server) to obtain DNS information. When receiving A mail, the DNS of your domain must provide delivery