This guide will take you through the steps to set-up the Dropbox integration in Zimbra. Once you have completed the steps in this guide you can follow the end-user guide at https://wiki.zimbra.com/wiki/Dropbox_integration_end_user_guide for the final OAuth set-up. Create a Dropbox Application (OAuth) To be able to use the Dropbox integration you have to create a […]
Tag Archives | administrators
When your security scanner alerts for jspawnhelper in Zimbra
Many administrators rely on third-party security scanners such as Crowdstrike Falcon to analyze their Zimbra server for malicious activity. One process that is frequently reported is jspawnhelper. What is jspawnhelper? While this is not very well documented, jspawnhelper can be run as the result of a call to ProcessBuilder.start() or Runtime.exec() in a java application. […]
10 steps to check Zimbra server for compromise
Hackers often install webshells on onpatched Zimbra systems and then wait for some time before actually abusing the compromised system. Especially on systems where critical security patches where installed too late, it may seem all was OK, where in fact a hacker has already gained access to the system, but did not do any other […]
Per user attachment size limits
Zimbra Postfix can be configured to use Postfwd. Postfwd can be seen as a firewall for Postfix and it allows the creation of rulesets to implement email restrictions. A new Admin UI Zimlet and extension leverage Postfwd to configure per user attachment size limits. More information and download is available on the Per user attachment […]
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 […]