Email in Zoho CRM stuck in "Sent" Status

We sent an email today directly from CRM (not IMAP). Usually, when we send our emails, we see a few different Statuses, such as "Delivered," "Opened," "Clicked" or "Bounced." But today we sent an email 8 hours ago and the status just keeps saying "Sent" (yes, I refreshed multiple times). Did the customer receive this email? We need to know. What does a Status of "Sent" mean in this case. Any help would be much appreciated.

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