The beta ended on June 22nd 2015, 00:00 GMT, and paid services will require payment. Users that registered during beta do not have to pay until July 31st 2015.
The service has two types of accounts: free and paid subscription. Free service allows receiving of emails. For all other functions, a paid subscription is necessary. The payment request is created as soon as you try to send an email, and the account is automatically upgraded when the payment is processed (and downgraded when it expires). The preferred payment method is Bitcoin. Bitcoin invoicing and payments are processed automatically in real time.
|Service||Free account||Paid account|
|Receive email attachments|
|Charge sender for emails|
If you do not know how to get bitcoins, CoinDesk provides a good overview of the options. You do not need to buy a whole bitcoin, bitcoins are divisible to 8 decimal places, so you can buy just 5 dollars (euros, etc.) worth of bitcoin. Once you receive the payment request from us, it will tell you how many bitcoins exactly you need and this will not change until you pay.