Hushmail did a real job on me, for a long time I had the free account, but something weird started happening.
I noticed that on the left side of the screen where it shows how much storage you have, started changing.
My free space started decreasing. I deleted e-mails on a regular basis and only had a few contacts.
I then deleted everything, contacts, drafts and the free space still was disappearing.
Eventually I couldn't even log-on, I was forced to pay to re-open my account.