Hi @ Tony Mu,
Yes. You can resume sending and receiving mail by adjusting the quota limits for user mailboxes.
You can also enable an archive mailbox for this user and store messages in the archive mailbox for recovery as needed.
Use the EAC to enable the archive mailbox:
- Go to the Recipients > Mailboxes.
- Select the mailbox. In the details pane, under In-Place Archiving, click Enable.
Use EMS to enable archive mailbox :
Enable-Mailbox "Tony Smith" -Archive
For more information about archive mailboxes, refer to this link: In-Place Archiving in Exchange Server | Microsoft Learn
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