Mail Boxes are
counted in the total size of your web hosting space.
This means that
if you have 2 x 50 meg POP3 mail boxes you have the
potential to use 100 megs of space on emails.
can happen very easily if your are a recipient of
spam and do not check your mail regularly.
Using the above
example : a SmallPond Starter Pak Hosting account
(100 megs) - when the 2 mailboxes reach their 50 meg
capacity, incoming emails will be sent back to the
sender with the message "Mailbox Full".