BCC a HTML email with Exchange 2013 does not work


Today there is an issue at a customer’s environment.
Background:
Exchange 2013 CU10
Problem:
There is a transport rule that will do a BCC emails to another SMTP address. All emails work, except if the email is sent by an iPhone in HTML format.
Solution:
N/A for now.
If you have faced any such issue, feel free to leave your comments below!
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