Who We Are
We are the global Zimbra experts with customers in more than 20 states and 10 countries Our proprietor, Mark Stone, adopted Zimbra for his own company in 2005 and became a Zimbra Partner in 2006. ...
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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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Zimbra ZBUG-4827: 100% CPU Utilization Due To AutoComplete (Contacts Ranking Database) Bug
In April 2025 I opened a Support Case with Zimbra, which resulted in Zimbra issuing ZBUG-4827: Contact Ranking fetch causing slowness. This is an AutoComplete...
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Handling a Zimbra Account Breach and Email Flood
At some point, you will suffer a Zimbra account breach and an email flood. This blog post will describe how to handle this situation. Do...
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Fail2Ban and PCRE Script Using Zimbra’s Daily Mail Report
While Fail2Ban's automation works great, we find that reviewing the "Recipient address rejected" section of Zimbra's Daily Mail Report yields evidence of potential Advanced Persistent...
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InboxExpo Key Email Deliverability Takeaways for B2B Senders
Enhancing Email Deliverability for B2B senders' outbound transactional and marketing emails was a core track at last week's InboxExpo. This post covers several key takeaways...
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Zimbra Fail2Ban Best Practices – Updated for 2024
This post contains our current Zimbra Fail2Ban Best Practices and will show you how to configure Fail2Ban optimally on your Zimbra servers. Bad actors, overly...
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Zimbra MariaDB Performance Tuning Guide
MariaDB is the single most common bottleneck we see when doing performance tuning on customers' Zimbra servers. This Zimbra-specific MariaDB performance tuning guide will help...
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Configuring BIND9 Caching DNS Servers For Zimbra
Zimbra servers make a lot of DNS requests, so having a locally available caching DNS server system for Zimbra to use is important. In helping...
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Zimbra Linux Kernel Tuning To Reduce Swap File Usage
Zimbra mailbox servers on Ubuntu 18/20 can benefit from Linux kernel tuning to reduce swap file usage. This post will show you how. Note: this...
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Host Your MTA-STS Text File on Amazon Web Services For Pennies Per Month
We know that deploying MTA-STS better secures inbound email and can prevent MITM and downgrade attacks. But you need a public web server to host...
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Zimbra Security Tip – Regulate Outbound Traffic With Stateful Firewalls
Historically, Zimbra firewalling has focused on regulating only Inbound traffic, but we can better protect our Zimbra systems if we also regulate Outbound traffic by...
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