What the typically means is the recoverable items of that user is reached its quota. If they are on litigation hold and that quota is reached you will see rejections like this
The recipient's mailbox is full and can't accept messages now. Please try resending your message later, or contact the recipient directly.
Houtz, Ryan
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I received this message when deleting a meeting event. However I've confirmed the users mail box is not full and he is able to receive any other message.
This is an Outlook 365 email account if that makes a difference.
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Adrian Cloghesy 0 Reputation points
2023-10-19T14:21:48.37+00:00 I just had the same issue, folder size was 37gb out of 100gb.
But there were 999996 emails in the Inbox.
I created a folder and moved emails out from the inbox and email started coming through.