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Please do not try to use the ancient, modified versions of DCC software distributed by some Linux packagers. Those versions do not detect bulk mail as well as more recent versions. Installations using those old versions also have problems using the public DCC servers that often make it necessary to add their IP addresses to the blacklist that protects the public DCC servers. The DCC source is available at  dcc-servers.net  and  Rhyolite Software .  The license on the free source is in the source as well as  dcc-servers.net . The free license is intended to cover individuals and organizations including Internet service providers using DCC to filter their own mail. Organizations selling anti-spam appliances or managed mail services are not eligible for the free license. https://www.dcc-servers.net/dcc/FAQ.html   Distributed Checksum Clearinghouse (DCC) Installation: Open UDP_OUT port 6277 in firewall. DCC RPM Sources: 1. https://www.mirrorservice.org/sites/dl.atrpms.net/el7-x8

Vipul's Razor is a distributed, collaborative, spam detection and filtering network. The primary focus of the system is to identify and disable an email spam before its injection and processing is complete. Open the following port in your firewall: TCP 2703 Outgoing : Razor2 Razor Installation # yum install pyzor perl-Razor-Agent Create Razor Home Directory # mkdir /etc/mail/spamassassin/.razor Enable the Pyzor plugin # vi /etc/mail/spamassassin/v310.pre # Razor2 - perform Razor2 message checks. # loadplugin Mail::SpamAssassin::Plugin::Razor2 Add the following to /etc/mail/spamassassin/local.cf # razor use_razor2 1 razor_config /etc/mail/spamassassin/.razor/razor-agent.conf score RAZOR2_CHECK 3.000 Restart # systemctl restart spamassassin Discover the Razor  # razor-admin -home=/etc/mail/spamassassin/.razor -register # razor-admin -home=/etc/mail/spamassassin/.razor -create # razor-admin -home=/etc/mail/spamassassin/.razor -discover Define Home Directory, Edit /et

Pyzor is a collaborative, networked system to detect and block spam using digests of messages.Using Pyzor client a short digest is generated that is likely to uniquely identify the email message. This digest is thensent to a Pyzor server to: Check the number of times it has been reported as spam or whitelisted as not-spam Report the message as spam Whitelist the message as not-spam Since the entire system is released under the GPL, people are free to host their own independent servers. There is,however, a well-maintained and actively used public server available (courtesy of SpamExperts) at: public.pyzor.org:24441 Open the following port in your firewall: UDP 24441 Outgoing : Pyzor TCP 24441 Incoming : Pyzor Pyzor RPM Sources: 1.  ftp://mirror.switch.ch/pool/4/mirror/fedora/linux/releases/22/Everything/x86_64/os/Packages/p/pyzor-0.5.0-10.fc21.noarch.rpm [This will not work ] 2. http://209.132.181.8/pub/archive/fedora/linux/releases/22/Everything/x86_64/os/Packages/p/p

AppArmor is a kernel enhancement to confine programs to a limited set of resources. AppArmor's unique security model is to bind access control attributes to programs rather than to users. AppArmor confinement is provided via profiles loaded into the kernel via apparmor_parser, typically through the /etc/init.d/apparmor SysV initscript (on Ubuntu, Follow the below link for details), which is used like this: # /etc/init.d/apparmor start # /etc/init.d/apparmor stop # /etc/init.d/apparmor restart # sudo apparmor_status AppArmor can operate in two modes: enforcement, and complain or learning: enforcement - Profiles loaded in enforcement mode will result in enforcement of the policy defined in the profile as well as reporting policy violation attempts to syslogd. complain - Profiles loaded in "complain" mode will not enforce policy. Instead, it will report policy violation attempts. This mode is convenient for developing profiles. To manage complain mode for i

Since Ubuntu 16.04 timedatectl / timesyncd (which are part of systemd) replace most of ntpdate / ntp.  timesyncd is available by default and replaces not only ntpdate, but also the client portion of chrony (or formerly ntpd). So on top of the one-shot action that ntpdate provided on boot and network activation, now timesyncd by default regularly checks and keeps your local time in sync. It also stores time updates locally, so that after reboots monotonically advances if applicable. Accurate time keeping is important for a number of reasons in IT. This setup is the best practice that helps with problem diagnosis and informal server monitoring. I am living in Asia that's why i'm using this pool. Install Chrony and Configure The NTP server: # sudo apt install chrony # vi /etc/chrony/chrony.conf #pool 2.debian.pool.ntp.org offline iburst server 0.asia.pool.ntp.org iburst server 1.asia.pool.ntp.org iburst server 2.asia.pool.ntp.org iburst server 3.asia.pool.ntp.org iburst

Static configurations usually need IP addresses as well as DNS resolvers plus routing. In this tutorial, we will cover Linux static configuration on Ubuntu 16.04. Note: We have three(03) networking interfaces including  loopback(lo) etho0 = ipv4 eth1 = private LAN &  eth2 = ipv6 . Step 1. Edit the /network/interfaces file # vi /etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 94.37.87.2XX netmask 255.255.252.0 gateway 94.37.X.1 dns-nameservers 8.8.8.8 8.8.4.4 dns-search datahead.biz auto eth1 iface eth1 inet dhcp auto eth2 iface eth2 inet6 auto Step 2. Restart the networking service (or reboot) Once you are confident the change has been made, and if you don’t want to reboot you can just restart the networking service. # sudo /etc/init.d/networking restart After doing this, and provided you don’t get any errors, your primary network interface should now be configured with the st

A hostname is a label that identifies a machine on the network. You shouldn’t use the same hostname on two different machines on a same network..You might ask yourself why you would need to change your hostname? The most common scenarios would be due to a domain name change, your business has changed its course, or because you have thought of something better. The hostname is used by many of the networking programs (such as sendmail, Apache servers) to identify the machine. By default, your server is started with the server’s given name as the hostname. Some software, such as cPanel, CWP , VestaCP requires a valid Fully Qualified Domain Name (FQDN) for the hostname. Types of hostnames (The hostname can be configured as follows): Static host name assigned by sysadmin. For example, “server1”, “wwwBot2”, or “host.datahead.biz”. Transient/dynamic host name assigned by DHCP or mDNS server at run time. Pretty host name assigned by sysadmin/end-users and it is a free-form UTF8 ho