Junk mail
Why does some good mail go to junk on Ipad?
iPad Air 4 Wi-Fi
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Sometimes an email message that you consider to be “good” might be incorrectly classified as “junk”.
Generally, you simply need to move the misclassified item from the Junk folder, to the associated Inbox folder, to re-train iPad into accepting future messages from the same sender and subject as being regular email.