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📱When Outlook for IOS or Android Fails Silently: Hybrid Setup, IIS Rules, and Hidden Blocks
Everything looks fine – the user sends an email from Outlook for Android, no errors pop up… but the message never arrives. In a hybrid Exchange setup with HMA enabled, things can go wrong in unexpected places. In this post, we track down an issue that doesn’t show up in IIS logs – and explain…
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🛡️Default FrontEnd Connector in Exchange: Open Door or Necessary Entry Point?
Did you know that your Exchange server might be allowing anyone to send anonymous emails to internal users by default? In this post, I explore the security implications of the Default FrontEnd receive connector, why it matters in hybrid environments, and how attackers might exploit it. Based on findings from real Risk Assessment Programs, I…
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✉️Finding the Bottleneck: Troubleshooting Hybrid Mail Flow
Hybrid mail flow can be tricky – sometimes everything looks fine, but messages vanish, bounce, or take mysterious detours. In this post, I walk through a real-world approach to diagnosing mail flow issues in Exchange Hybrid setups. From checking connectors to diving into logs, you’ll find practical steps to trace where your emails really go…
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📅Cross-Forest Free/Busy with Meeting Rooms: Making It Work in Exchange
Free/Busy lookups between forests are tricky enough — and meeting rooms make them even more so. In this post, I walk through a scenario where calendar sharing works fine for users, but room mailboxes stay silent. If you’re dealing with a cross-forest Exchange setup and struggling with room availability, this guide will help pinpoint where…
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🌐Federation Trust in Exchange: When Trust Breaks Down
Federation Trust is the backbone of cross-organization sharing in Exchange – but what if it breaks? In this post, I cover a real-world case where the trust silently failed, impacting Free/Busy lookups and external sharing.
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