Using Zimbra’s DoSFilter and Failed Login Lockout Policy Together

Zimbra’s DoSFilter (Denial of Service Filter) is a mechanism to throttle or block IP addresses that have a repeated number of failed logins to your Zimbra system.  Zimbra’s Classes of Service include a Failed Login Lockout policy that will put a mailbox in Locked Out mode, hopefully before a brute …

Current State of The Market – Zimbra, Office 365 and Mimecast

This month (July 2018) we started selling Office 365 and Mimecast, and we expect to add more products and services in the coming weeks to further enhance customers’ mission critical email experiences. One question I’m asked frequently is: “Is Zimbra still the best email and collaboration solution for my company, …