Archive | Security & Privacy

Zimbra advanced mobile device management with Scalefusion MDM

Zimbra 10 is natively supported in Scalefusion Mobile Device Management (MDM). When used together Zimbra and Scalefusion gives your IT teams visibility and control required to secure, manage and monitor any corporate-owned or employee-owned devices that access corporate data. This includes mobile devices (Android and IOS) and managed Windows devices such as laptops. In other words with […]

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Configure Zimbra OpenDKIM to sign the Subject header

By default Zimbra OpenDKIM does not sign the Subject header. At this time the configuration of what headers are signed by Zimbra OpenDKIM cannot be done via zmprov. There is a pending feature request to make these headers configurable via zmprov. In this article you will learn how to configure Zimbra OpenDKIM by customizing the […]

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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 […]

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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 […]

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Optimizing Zimbra security and TLS settings via a script (updated August 2023)

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 […]

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