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Executive Summary A spoofing vulnerability exists in Microsoft Exchange Server which could result in an attack that would allow a malicious actor to impersonate the user.
This update addresses this vulnerability.
To prevent these types of attacks, Microsoft recommends customers to download inline images from different DNSdomains than the rest of OWA. Please see further instructions in the FAQ to put in place this mitigations.
Update & Detail Microsoft Exchange Server Spoofing Vulnerability 
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thank you Templateism for the design - You should have written the code a little more complicated - Nothing Encrypted anymore