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There are some complications with encryption Assuming Microsoft uses FIPS compliant encryption, then you would have to change the default TLS configuration from opportunistic encryption to forced encryption. Transmission of CUI is allowed as long as it is enclosed in FIPS approved encryption. Though TLS only encrypts the transfer between mail servers so something like S/MIME might be needed.
might that not mean that all communication between his mail server and others would all have to have the same encryption settings?
- You configure this in the exchange connector settings, assuming you aren't setting these up for each organization you send mail to (which is entirely possible), you can use a wildcard where you normally specify the partner domain.