If one or more external addresses are included in Distribution Groups, will the email be filtered?

for Microsoft 365

 

Q.

If one or more external addresses are included in Distribution Groups, will the email be filtered? 

 

A.

Yes, it will. However, the address(es) will be recognized as BCC, not "To" because the external address(es) will not be included in the mail header due to the Microsoft 365 specification.

 

 

          
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