I just started my 7-day trial with SCRYPTmail but I'm dissapointed to know
that the only cryptocurrency you can spend for a proper subscription is BitCoin.
Basically, SCRYPTmail needs to offer other cryptocurrencies to pay with like Ethereum and
particularly ZCash and Monero which are Privacy-centred currencies and should be right up
SCRYPTmail's alley.
The best info I have is that active development of SCRYPTmail stopped a couple years ago. Try contacting support@scryptmail.com if you believe there is a service/payment issue.