In this article you will learn how to use Spamhaus Hash Blocklist (HBL) to improve email protection in Zimbra. For a long time administrators of Zimbra have relied on Spamhaus to fight incoming spam by configuring Postfix using traditional blacklists. These traditional blocklists work by blocking IP (ranges) and domains of known spammers. When an […]
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Zimbra Patches: 9.0.0 Patch 30 + 8.8.15 Patch 37
Hello Zimbra Friends, Customers & Partners, Zimbra 9.0.0 Kepler Patch 30 and 8.8.15 James Prescott Joule Patch 37 are here. These patches include the following listed in their respective releases What’s New Security Fixes Fixed Issues Known Issues Please refer to the release notes for the patch installation on Red Hat and Ubuntu platforms. An […]
Optimizing Zimbra security and TLS settings via a script (updated May 2024)
By Barry de Graaff on February 8, 2023 in Product News, Community, Open Source, Partners, Security & Privacy, Zimbra SkillZ
A partner has requested a script to implement the Security tips and TLS settings documented at https://wiki.zimbra.com/wiki/Cipher_suites and https://wiki.zimbra.com/wiki/Secopstips . At Zimbra we love scripts! This article shows a script that configures Zimbra with strong TLS and security settings. Prerequisites You have set up a correct hostname and DNS, to check, run the following as […]
Zimbra Referrer-Policy best practice
By Barry de Graaff on February 1, 2023 in Product News, Did You Know, PowerTips – Admins, Security & Privacy
The “Referer” header is a HTTP header that is added by the web browser whenever a request is made. A Zimbra user who receives an email with links or images in the Zimbra web interface may unknowingly share information of the Zimbra server when clicking the link or viewing inline-images. For example when an email […]
Introducing Zimbra Microsoft Teams integration
Teams Power is an integration with Zimbra and Teams and is provided via Innovazionedigitale. With this integration customers using Outlook with a 365 subscription can use Teams from both the Zimbra calendar and Microsoft Outlook. The integration is available for Zimbra Classic and Modern UI on Zimbra 8 and above. More information on this Zimlet […]
Protecting Zimbra with Sucuri web application firewall
By Barry de Graaff on January 11, 2023 in Product News, Partners, PowerTips – Admins, Security & Privacy
You can enhance the security of your Zimbra servers by using a web application firewall (WAF). By using a web application firewall you can add the following protections to Zimbra: Geo blocking, geo fencing Blocking or allow IP addresses Emergency DDoS protection Block anonymous proxies Block top three attack countries Manage HTTP Security Headers Limited […]