DNS is an important aspect of any Zimbra installation. This article will help those that are new on installing Zimbra to get an idea what needs to be configured to get started. There will also be some tips and best practices that will improve security and email deliverability that may be lesser know even to […]
Archive | PowerTips – Admins
Zimbra Referrer-Policy best practice
By Barry de Graaff on February 1, 2023 in Product News, Did You Know, PowerTips – Admins, Security & Privacy
The “Referer” header is a HTTP header that is added by the web browser whenever a request is made. A Zimbra user who receives an email with links or images in the Zimbra web interface may unknowingly share information of the Zimbra server when clicking the link or viewing inline-images. For example when an email […]
Did you know? Zimbra HTTP Strict Transport Security (HSTS)
By Barry de Graaff on January 18, 2023 in Community, Did You Know, Partners, PowerTips – Admins, Security & Privacy
The HTTP Strict-Transport-Security response header (often abbreviated as HSTS) informs browsers that the site should only be accessed using HTTPS, and that any future attempts to access it using HTTP should automatically be converted to HTTPS. What does HSTS do for improving security? You have HSTS configured on Zimbra and have configured a correct TLS […]
Protecting Zimbra with Sucuri web application firewall
By Barry de Graaff on January 11, 2023 in Product News, Partners, PowerTips – Admins, Security & Privacy
You can enhance the security of your Zimbra servers by using a web application firewall (WAF). By using a web application firewall you can add the following protections to Zimbra: Geo blocking, geo fencing Blocking or allow IP addresses Emergency DDoS protection Block anonymous proxies Block top three attack countries Manage HTTP Security Headers Limited […]
Did you know? Zimbra Postscreen provides additional protection against mail server overload
In Zimbra you can optionally enable Postscreen as an additional Anti-SPAM strategy. Postscreen will offer additional protection against mail server overload. One postscreen process handles multiple inbound SMTP connections and decides which clients may talk to a Post-fix SMTP server process. By keeping spambots away, postscreen leaves more SMTP server processes available for legitimate clients […]
Update Zimbra TLS cipher suites to disable Diffie-Hellmann
This blog post is outdated since Zimbra version 9.0.0.P34, 8.8.15.P41, 10.0.2 where Zimbra introduced OpenSSL FIPS. Please follow the updated steps at https://wiki.zimbra.com/wiki/Cipher_suites. In a previous blog and wiki we have shown how to configure Zimbra with a strong TLS configuration. Since encryption is always evolving we have updated the previous blog and wiki to […]