Hello Zimbra Friends, Customers & Partners, The ClamAV package has been upgraded to version 0.105.2 to fix multiple vulnerabilities. Zimbra 9.0.0 Kepler Patch 31 and 8.8.15 James Prescott Joule Patch 38 As part of this patch, we are releasing the updated ClamAV and its related packages which are installed only on MTA nodes. Since this […]
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A Milter for using Spamhaus HBL with Zimbra Postfix
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 […]
Improve email Zimbra protection with Spamhaus HBL
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 […]
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 […]