A typical headache for Microsoft Exchange Server administrators is to setup load-balancing with port 25. They face the issue that, typically in these setups, they no longer see the source client IPs of the actual clients; All traffic is translated and is presented to the SMTP service with the load balancer IP as source. This … Continue reading "Field notes: Make the actual source client IP visible for a load-balanced SMTP service"
In this blog post, I want to walk you through my experiences with setting up and enable the interoperability between Microsoft Teams and on-premises Microsoft Exchange Server environments. Since the beginning of this year, Microsoft Teams adoption has seen a tremendous uptick in usage. Organizations needed to adopt Microsoft Teams as their Unified Communications (UC) … Continue reading "Field Notes: Meeting the requirements for Interoperability between Microsoft Teams and Microsoft Exchange Server"
The last couple of weeks I have been working with several Microsoft Exchange Server environments. I encountered lots of expired certificates. Organizations wanted help with that. One of the questions that kept coming back was: Do I press Yes to change the default certificate, when I enabled the certificate for SMTP? The official answer is … Continue reading "Field notes: What is the current default SMTP certificate for your Exchange Server environment?"
Last week an announcement was made: The native mail app in Apple's iOS has zero-day vulnerabilities, deemed critical. No patch is available at this time. More information about the vulnerability can be found here. For you as IT admin this means that you probably have work to do. The main questions you may be facing … Continue reading "Security Officer: Please block the iOS native mail app (for) now!"
The issue During one of my Exchange Online migration projects I encountered the following error on several mailboxes: "Message : Error: Couldn’t switch the mailbox into Sync Source mode. This could be because of one of the following reasons: Another administrator is currently moving the mailbox. The mailbox is locked. The Microsoft Exchange Mailbox Replication … Continue reading "Exchange migration “Couldn’t switch the mailbox into Sync Source mode”"
As a consultant I do a lot of migrations or assist in them. In this case I wrote my own script for processing the information generated by the Mailbox Replication Service. This service is used in Microsoft Exchange on-premises and in the cloud for migrating the mailboxes between databases or environments. After multiple times doing … Continue reading "TOOL: My own Exchange Move Request Report script"