Contacts don't recieve marketing mail


I've send out an e-mail to "contacts" and 'acounts".  Both times no one received an email according to the statics. There are some e-mails send, but no one opens them or clicks on the links. We called some of our clients to check if they received the email and they did. 

Does anyone have an idea, why I don't see which accounts and contacts received and clicked on the emails?

Kind regards,


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