The remaining capacity of your current mailbox has been less than 5%, although this will affect your normal use, but we recommend that you upgrade to the mailbox capacity.
You can double the current capacity of the mailbox to 20GB, to accommodate more messages. The upgrade is free and will not be deducted from your credit. Immediately doubling capacity
I wish a smooth upgrade your mailbox!
Thanks for taking these additional steps to keep your account safe.