Set-MessageClassification Exchange cmdlet issued (25426) how to monitor with email alert

[bob]

Man, that Event ID 25426 in the Windows Server Event Viewer pops up whenever someone fires off the Set-MessageClassification cmdlet in Exchange. It's basically logging the moment an admin tweaks how messages get classified, you know, like slapping on labels for sensitivity or compliance stuff. I see it under the MSExchange Management log, and it details who did it, from what machine, and exactly what classification got changed. Picture this: some guy runs the command to update a rule on email tags, and boom, the event records the timestamp, the user account, even the old and new values if it's a big shift. You might want to watch for it because it could signal someone messing with security policies without telling anyone. Or maybe it's just routine maintenance, but tracking it keeps things transparent around your server setup. Hmmm, if you're paranoid about unauthorized fiddling, this event is your first clue.

Setting up monitoring for it with an email alert isn't too tricky through the Event Viewer itself. You open up Event Viewer, right-click on that MSExchange Management log, and pick Attach Task To This Event or something close. I do it by selecting the event, then choosing Create Task from the Actions pane. You name your task, set it to run whether user is logged on or not, and trigger it only when Event ID 25426 shows up. For the action, you pick Send an email, and fill in your SMTP server details, who it's from, and the recipient-you. Add the event details into the message body so you get the who, what, when right in your inbox. Test it by forcing a trigger if you can, but usually waiting for a real one works fine. It runs on a schedule tied to the event, no extra hassle.

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Note, the PowerShell email alert code was moved to this post.