Email Storage limit

[#1]

Is there a limit to the amount of data allowed to be taken up by email left on the Plusnet servers?  If so, how can I found out how much is stored, and what happens if I exceed the limit?

[#2]

http://www.plus.net/support/email/common_questions.shtml#storageLimit
Note that the limit is the total for all addresses
I think that you get a warning email first before it is removed