Who We Are
We are the global Zimbra experts with customers in 20 states and 10 countries. Our proprietor, Mark Stone, adopted Zimbra for his own company in 2005 and became a Zimbra Partner in 2006. We have...
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We provide our customers with email systems that are performant, reliable, secure and cost-effective — systems that meet each customer’s Mission Critical Email needs. Zimbra Hosting, Licensing, Training and Professional Services Mission Critical Email is...
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How To Defend Zimbra Against Distributed Brute Force Login Attacks
Increasingly we are seeing distributed brute force login attacks on our Zimbra hosting environment, as well as on our on-premises customers' Zimbra systems. These login...
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Architectural Design Reference for Large Zimbra Deployments in Amazon Web Services
This post documents a high-level architectural design reference for hosting large Zimbra deployments in Amazon Web Services cost-effectively, with a high degree of security, performance,...
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Zimbra Fail2Ban for Submission Only
In a previous blog post, I documented how to configure Zimbra's DoSFilter in conjunction with a Failed Lockout Policy with the objective of blocking a...
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Zimbra Gandi SSL Certificate Installation
This post will you show you how to install Gandi SSL certificates in Zimbra with the new Sectigo certs that have replaced the expired Comodo certs.
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Office 365 Address Verification, SPF, DMARC and DKIM
To date, when most people think of anti-spam, they think of blocking inbound spam. Most people don't think about taking steps to ensure that their...
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Zimbra Performance Tip For Busy Zimbra Servers – Modify updatedb Settings
Do any of these describe your Zimbra system? You have a large mail store (1TB or more) Your Zimbra system is busy with a lot...
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Zimbra Patching – Recommended Best Practices 2019
During yesterday's Zeta Alliance call, Zimbra Patching, recent Zimbra exploits and their mitigation were a featured topic of discussion. The Zimbra forums have some very...
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Java Improvements Make Upgrading Zimbra Attractive
Zimbra 8.8.12 quietly replaced Java 8 with Java 11, and combined with a change in Java Garbage Collectors, we are seeing significant mailbox server performance...
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Zimbra Anti-Spam Best Practices – Updated for 2020
Back in 2014 I wrote a good chunk of the Zimbra Anti-Spam Strategies community wiki. In the intervening six years, a lot has changed, but...
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Zimbra on Amazon Web Services – Disk Reference Architectures (Updated December 6, 2020)
During the past several years I have migrated a number of Zimbra systems to Amazon Web Services ("AWS"). These "real-world" experiences led to my being...
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