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 […]
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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 […]
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 […]
Zimbra SkillZ: Legal Intercept in Zimbra
Hi Zimbra Customers, Partners & Friends, Did you know that Zimbra has a Legal Intercept for Law Enforcement feature? This is used to obtain copies of email messages that are sent, received or saved as drafts from targeted accounts. Intercepted messages are sent to a designated shadow email address. Legal Intercept can be configured to […]
Zimbra Email Security Webinar Series: DNSSEC (updated)
Hello Zimbra Customers, Partners & Friends, Zimbra’s Barry de Graaff and Randy Leiker from Skyway Networks team up for a webinar series focused on Email Security. These hands-on webinars will include practical how-to information and best practices to help you maximize Zimbra security. In this fourth episode of the Zimbra Email Security Webinar Series, join […]