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External sender tagging: “Dumb & Dumber”

External sender tagging: “Dumb & Dumber”

So, my first very own blog post. In this post I’ll try and highlight the new built-in external sender tagging feature for Exchange online. I’ll show you how to implement it, an alternative, and why I think neither are perfect. Without further ado… Let’s dig in. Some companies use exchange transport rules to put the prepend [EXTERNAL] (or something alike) in their subject line when receiving e-mails from the outside. This can help users recognize potential phishing attempts. My company for…

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