Archive | PowerTips – Admins

How to Install Zimbra Collaboration 8.8 on Ubuntu 16.04 LTS

Greetings, Everyone. In this blog post we will cover the installation of the latest Zimbra Collaboration 8.8 Network Edition release on Ubuntu 16.04 LTS, using dnsmasq as a DNS Server. These steps cover a single-server installation. If you are looking for multi-server installation steps, please visit our official guide. This blog post is a bit […]

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How to Reduce Incoming SPAM and MTA Overload using Postscreen

Zimbra Postscreen, availabile starting with Zimbra Collaboration 8.7, provides additional protection against mail server overload. One postscreen process handles multiple inbound SMTP connections and decides which clients may talk to a Post-fix SMTP server process. By keeping spambots away, postscreen leaves more SMTP server processes available for legitimate clients and delays the onset of server overload […]

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How to block incoming users or domains

Hello everyone, Zimbra Collaboration includes anti-SPAM and antivirus technologies such as Postscreen, Spamassasin, Amavis, ClamAV, etc. But sometimes, for legal reasons, etc., we need to block certain senders or even entire domains from sending unsolicited email. To do this, we will use the tools that come native to Zimbra Collaboration, and with a few simple […]

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Zimbra Desktop, the best ally of a Zimbra experience in your workstation

Zimbra Desktop is a free and open source email client application that gives you online and offline access to all your email accounts in one place. It’s the best ally offering the best Zimbra experience in your workstation without any additional cost, and available for Windows, Mac and Linux. Principal advantages of using Zimbra Desktop Zimbra […]

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How to use the new Zimbra Migration Tool: pst file to Zimbra Desktop

Hello, Everyone. On today’s blog I will answer the frequently asked question: How can I import a .pst file into my Zimbra Desktop? The answer is with the new Zimbra Migration Tool, included in Zimbra Collaboration 8.7 and above. It doesn’t even need an installation, just extract and execute! Identifying the .pst file to Import […]

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ClamAV v0.97 included in ZCS 8.0.6 and below tags all messages as **UNCHECKED**

Hello Everyone. If you are using ZCS 8.0.6 and prior: starting 22 October 2016, anti-virus definitions will no longer update, and your ClamAV instance will stop working entirely. ClamAV EOL source: http://blog.clamav.net/2016/05/clamav-097-engine-end-of-life.html This is a real risk for all outdated ZCS versions, and as a visual symptom, all your messages are being tagged as **UNCHECKED**. […]

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