All FASO email accounts include the maximum allowed storage, 20G or 20480MB, per email account.
NOTE: If your mailbox is full, you will not be able to receive new emails. The sender will get a bounce-back error. However, you would still be able to send out emails as normal.
You can check your data usage, as follows:
If you wish to reduce the amount of storage you are using, see this FAQ:
How to Delete Multiple Emails and Email Folders
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