This article is a how-to guide on installing Fail2Ban to block attacking hosts using a null route or blackhole routes. This can help mitigate brute force attacks on Zimbra. Especially brute force attacks on SMTP are very common. Prerequisite: Fail2ban has been tested in combination with netfilter-persistent and iptables. If you use ufw or firewalld […]
Archive | Community
Nextcloud Talk Zimlet
Zimbra loves Nextcloud! And that is why Zimbra and Nextcloud work together to make both products integrate seamlessly. The Nextcloud Talk Zimlet add a button in the new appointment window that allows you to create a Nextcloud Talk meeting from the Zimbra Calendar. Screenshots Installing This Zimlet depends on the installation of Nextcloud Zimlet for […]
Zimbra with Let’s Encrypt Certificates a step-by-step guide (update)
By Barry de Graaff on August 10, 2022 in Community, Security & Privacy, Zimbra Server, Zimbra SkillZ
This article is a step-by-step instruction on setting up a Zimbra with Let’s Encrypt certificates. If you are running a multi server installation of Zimbra it is recommended you set-up a dedicated VM for obtaining the Let’s Encrypt certificate and follow this blog. Prerequisites This guide assumes you are using Ubuntu 20 and you have […]
Automated installation of Zimbra and Lets Encrypt update!
Previously we introduced the zinstaller script that can be used for automating the installation of Zimbra. The zinstaller script will install a Zimbra 9 single server on Ubuntu 20 and will also obtain and install a 60-day trial license. It now also supports automated installation of Zimbra with Let’s Encrypt certificates and it will take […]
Zimbra SkillZ: Add an External Email Warning in Zimbra via the Admin Console
Hello Zimbra Customers, Partners & Friends, New with 9.0.0 Patch 25, you can add an external email warning in Zimbra using the Admin Console. An external email warning message alerts you when you receive email from an external domain. This is done using a Sieve filter, and it can be enabled per account, COS, domain […]
Zimbra SkillZ: Using Sieve Filters on Zimbra via the Admin Console
Hello Zimbra Customers, Partners & Friends, This article is a short how-to on using Sieve filters on Zimbra via the Admin Console. Sieve is a powerful scripting language for filtering incoming email messages. While Zimbra supports user set incoming email filters, the Sieve filters are meant to be set up and installed by administrators. Here’s […]