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Blocking Mails Based on Subject in Zimbra

Blocking Mails Based on Subject in Zimbra

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Welcome back! In this post, let’s talk about tightening our Antispam or Spamassassin in Zimbra. In real-time, there may be a serious reason for filtering and blocking mails based on subject that contain certain structures or words. Here are the steps to achieve this objective in Zimbra 8.5 and later. 1) Create a policy file inside /opt/zimbra/data/spamassassin/rules/ as root user e.g. Here, SUB_ATTACHMENT is a rule that filters the mail header based on the regular expression match of Subject. The describe…

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Enable Authentication In Zimbra CBPolicyd Webui

Enable Authentication In Zimbra CBPolicyd Webui

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Hello there! In this post, I’m going to write about how to enable authentication in Zimbra CBPolicyd Webui. If you use Zimbra but haven’t yet used CBPolicyd, I recommend you to see me previous post where I discussed about installation and use of CBPolicyd for managing mail related rules or restrictions in Zimbra. Until now, we don’t have any kind of authentication mechanism to protect our CBPolicyd’s web panel. So, let’s go ahead and setup an authentication method for our…

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LAMP- Installation and Configuration in CentOS 7

LAMP- Installation and Configuration in CentOS 7

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Hello! Today, let’s install and configure a web server (Linux + Apache + MySQL + PHP = LAMP) in CentOS7 platform. I think this subject can be very helpful to web developers, students and system administrators. Without any adieu, let’s get started with the installation and configuration. Installation of CentOS 7 I’ve already written blogs on installation and initial configuration of CentOS 7 operating system in my previous posts. You can refer to these blog posts: Creating VM in VMware…

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NFS Sharing Between CentOS Servers

NFS Sharing Between CentOS Servers

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In this blog, I’m going to describe how we can share folders between CentOS servers using Network File System (NFS). For this purpose, I’m setting up two CentOS 6.5 Minimal servers named as CentOS-1 and CentOS-2. The IP addresses of CentOS-1 and CentOS-2 are 172.16.5.5 and 172.16.5.6 respectively. I’m going to create a folder in CentOS-1 machine and then share it with CentOS-2 machine. Before getting into folder sharing process, I suggest you to go through my previous blog articles on CentOS…

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How To Restore Zimbra When LDAP DB Is Corrupted

How To Restore Zimbra When LDAP DB Is Corrupted

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A week ago, I received a call from one of our clients to whom we provide system and networking support. They had called me to inform that their Zimbra server had stopped working after an unexpected power outage. So, I asked them to provide me a remote access to their server so that I could analyze the cause of the problem. It didn’t strike me as a big deal then because there had been lots of issues with this server previously…

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Custom Disk Partitioning in CentOS

Custom Disk Partitioning in CentOS

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Here, I’m going to explain how we can perform custom disk partitioning while installing a CentOS system. This is a continuity to my earlier blog in which I wrote about the installation of CentOS 6.5 Minimal system. If you haven’t read my previous blog and want to know from where I’m continuing this blog, please read this blog first: Installation of CentOS 6.5 Minimal OS Custom Disk Partitioning Now, let’s get started. After I selected Custom Disk Partitioning during the…

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Installation of CentOS 6.5 Minimal

Installation of CentOS 6.5 Minimal

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Hello! In this blog, I’m going to write about how to install CentOS 6.5 Minimal operating system. To briefly introduce CentOS; it is an open-source operating system based on Linux kernel and derived from Red Hat Enterprise Linux. It is developed and maintained by the open source community. This open community itself provides support for the users of CentOS. Installing CentOS 6.5 Minimal For this post, I’m installing CentOS version 6.5 Minimal. You can get it from this download link.  I’m also installing…

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CoovaChilli With EasyHotspot And Radius

CoovaChilli With EasyHotspot And Radius

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Hello and welcome! Thank you for visiting my blog. Today, I’m going to write about  CoovaChilli, formerly known as ChilliSpot. It is an opensource Wi-Fi hotspot solution. I’m setting up CoovaChilli with EasyHotspot, also an open-source web portal. And FreeRadius server is being used for authentication. If you want to do it Ubuntu, please read this article. Before I jump into the setup, I would like to shed some lights on the problem I’m trying to solve here. This project has been done to…

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