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Connection Limit Protection: This option configures iptables to offer more protection from DOS attacks against specific ports. It can also be used as a way to simply limit resource usage by IP address to specific server services. This option limits the number of concurrent new connections per IP address that can be made to specific ports This feature does not work on servers that do not have the iptables module xt_connlimit loaded. Typically, this will be with MONOLITHIC kernels. VPS server admins should check with their VPS host provider that the iptables module is included Note: Run /etc/csf/csftest.pl to check whether this option will function on this server Step: Go to your CSF WebUI Panel and Select " Port Flood Settings" : You can set limit for the number of connections to particular port by altering the value “CONLIMIT”. CONNLIMIT = 80;20,443;15 The above value will limit only 20 connections to the port 80 and 15 connections to the port 443 from singl

MailScanner is a highly respected open source email security system design for Linux-based email gateways. It is used at over 40,000 sites around the world, protecting top government departments, commercial corporations and educational institutions. This technology has fast become the standard email solution at many ISP sites for virus protection and spam filtering. MailScanner scans email for viruses, spam, phishing, malware, and other attacks against security vulnerabilities and plays a major part in the security of a network. Install MailScanner First stop and disable postfix. We will use MailScanner in the future. # systemctl stop postfix # systemctl disable postfix Download MailScanner and install: # cd /usr/local/src/ # git clone https://github.com/MailScanner/v5.git # cd v5 # cd builds # rpm -ivh MailScanner-5.2.2-1.rhel.noarch.rpm # /usr/sbin/ms-configure 1. Hit Enter to start 2. Intsall an MTA? [1] : N 3. Install EPEL? : n 4. Install missing tnef via RPM?

I am using MailScanner Email Security Gateway to scan emails for viruses, spam, phishing, malware, and other attacks against security vulnerabilities. Under the hood, MailScanner uses ClamAV(clamd) for virus scan, and uses Spamassassin to scan for spams. I am also using CWP7pro.admin where all packages are already installed and running smoothly. You just need prepare your ClamAV antivirus usable for MailScanner. 1. ClamAVInstallation (Install ClamAV): At first check the below packages are installed or not. If any packages is missing , run the below command to install # yum info clamav-server clamav-data clamav-update clamav-filesystem clamav clamav-scanner-systemd clamav-devel clamav-lib clamav-server-systemd # yum install clamav-server clamav-data clamav-update clamav-filesystem clamav clamav-scanner-systemd clamav-devel clamav-lib clamav-server-systemd Unrar RPM Sources: http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el7.rf.x86_64.rpm  [ This link will

The Bayesian classifier in Spamassassin tries to identify spam by looking at what are called tokens; words or short character sequences that are commonly found in spam or ham. If I've handed 100 messages to sa-learn that have the phrase penis enlargement and told it that those are all spam, when the 101st message comes in with the words penis and enlargment, the Bayesian classifier will be pretty sure that the new message is spam and will increase the spam score of that message. In order for SpamAssassin to be accurate, you must train it on your specific mail patterns. SpamAssassin has a Bayesian classifier that can be used to help refine the classification of spam mail. The sa-learn interface allows you to train SpamAssassin to recognize good mail and junk mail. You need to train with both spam and ham mails. One type of mail alone will not have any effect. To filter for spam: Save spam into a new mail folder called Spam Save non-spam (ham) into a new folder called Ham. You m

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