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Blocking Mails Based on Subject in Zimbra

Blocking Mails Based on Subject in Zimbra

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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Restricting Certain Users from Sending/Receiving External Mails in Zimbra

Restricting Certain Users from Sending/Receiving External Mails in Zimbra

Hello! In this post, I’m going to talk about how to configure a Zimbra server to restrict certain users from sending or receiving mails from external domains. In order to achieve this objective, Zimbra provides two alternatives: one using CBPolicyd (web based) and another using MTA restrictions (cli based). Here I’m covering both methods. First, let’s have a look at CBPolicyd. Note: The methods mentioned here are tested successfully in ZCS 8.5 and ZCS 8.6. I cannot confirm its validity…

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Zimbra Distribution Lists Disappearing Issue

Zimbra Distribution Lists Disappearing Issue

Welcome! In this post, I’m once again going to discuss about Zimbra Collaboration Suite. This is about an incident that I recently came across, in which some of the mail distribution lists of one of our clients got automatically removed from the system. On doing some research, I learned that this type of issue was faced in past versions of ZCS, and had been resolved long ago. However, in this case, our client had the latest ZCS version of the…

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Setup Zimbra Mail Server-Post Installation

Setup Zimbra Mail Server-Post Installation

Welcome back! If you’ve been following up with my previous blogs, it is a continuity to my last blog on how to setup Zimbra mail server in CentOS. Till now, I’ve already covered the preparation and installation of ZCS package. From here, I’ll get into the post-installation part for our mail server setup. Changing SSH Port As we all already know, SSH daemon by default runs on port 22. So, it is a good practice to change it to some…

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Setup Zimbra Mail Server in CentOS

Setup Zimbra Mail Server in CentOS

Hello and welcome back to my next blog! In this post, I’m going to share how to setup Zimbra Mail Server in CentOS server. Since I’m going to cover this topic from start to end, it might be a long read and I hope you’ll manage to go through it. Just to give you a brief introduction of Zimbra, ZCS is one of the World’s largest open-source collaboration projects and it is an ideal solution for all sorts of mail related…

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