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I checked some of your forms and I didn't found any failed log.
Could you share a specific form ID or email address? By doing this, we can help yo better.
In addition, if the related email address has the email log without any error, I suggest you to check your Spam, Junk, Promotion or etc. folders. Because, sometimes email submissions could be placed wrongly in mailbox.
Please, reply to this thread with the specific email address or form ID. I'm waiting for your answer.