exchange, outlook 2016

Emails that I am sending from the mailbox is not reaching the recipients in Bcc. Recipients in To and Cc are getting the emails.
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Please provide a little clarification on what types of addresses are in the BCC field on the e-mails. What if anything do your exchange tracking logs say when you look up the e-mail in question.
Check outgoing logs if those BCC addresses are ever mentioned. Also check for the bounce messages, it should tell you why it was bounced.

Obviously, you also need to tell us if you ever used those failing addresses in the TO or CC field, and if it succeeded then.

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