The protection period is at least 90 days, depending on the age of the account.
You can view and edit the list of deleted aliases as per the below screenshot:
If you terminate your mailbox-account, your main address is blocked for at least 90 days, depending on the age of the account. Only after this period users can register this address again.
Suspension of your account due to insufficient credit
Please refer to this article: https://kb.mailbox.org/display/MBOKBEN/What+happens+when+my+credit+runs+out
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