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Security Explainer MS Exchange
Using on-premise Microsoft Exchange for email and calendar functions and making them remotely available creates a publicly-discoverable, attractive point of attack for hackers.
If you can’t move your email to a secure and reliable cloud service right now, there are still some things you can do to minimize your exposure and limit your Microsoft Exchange vulnerabilities, including:
Removing the Exchange admin panels from the public internet.
Using a Firewall Access Control List (ACL), Virtual Private Network (VPN), or Proxy and Protective DNS.
Limit the functionality of Exchange Web Services and remote access.
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