This is an old issue but Zimbra installations can have a very long life span, in addition it is a good precaution to validate your configuration, just in case. Zimbra Proxy has the ability to strictly enforce which values are allowed in the Host header passed in by the client. This is enabled by default […]
Author Archive | Barry de Graaff
Enhance password security by rejecting common and leaked passwords
In this article you will learn: How to prevent users from choosing common passwords How to add leaked passwords to the list of passwords to reject Enabled the Reject Common Passwords feature You can enable the Zimbra Reject Common Passwords on a per account basis or for an entire Class Of Service (CoS). To enable […]
How to disable Zimbra two factor trusted devices
By Barry de Graaff on June 26, 2024 in Did You Know, Partners, PowerTips – Admins, Security & Privacy
It is well known that you can enable 2FA in Zimbra Network Edition to enhance account security. All details on Zimbra 2FA can be found at https://wiki.zimbra.com/wiki/Zimbra_Two-factor_authentication Zimbra also enables by default the Trusted Devices feature. This allows users to enter their 2FA token only once for each device. Consider turning off the Trusted Devices […]
Upgrade & Migration Guides for upgrading to Zimbra 10
We have released the Upgrade & Migration Guides for upgrading Zimbra 8.8.15 and 9 to Zimbra version 10. For Non-NG setup you can use the following guides: In-Place Upgrade Guide (Single and Multi-Node setup)Rolling-Upgrade Guide (Multi-Node setup)For NG setup 9.0.0, 8.8.15 for both Network Edition and FOSS you can use the following guides: In-Place Upgrade […]
Spam blocklist SORBS has been shut down, update Anti-Spam settings
The spam blocklist SORBS has been shut down. By default Zimbra uses SORBS via SpamAssasin, but also many Zimbra Administrators have set-up SORBS as part of Postfix MTA restrictions. Monitor the Zimbra MTA logging in /var/log/zimbra.log and make changes to your configuration to make sure email continues to be delivered properly. Postfix reject_rbl_client Check Zimbra’s […]
Importing Outlook PST into Zimbra (how to import large TGZ files using Zimbra REST API)
In this article you will learn how to import emails and folders from Outlook PST files into Zimbra using the command line. This article is targeted to system administrators who are interested in automation of PST imports. Some knowledge of Bash and PowerShell scripting is recommended as you may want to change the scripts used […]