It seems that subscribing to be a tester would be best bet. Probably would get in contact with right people through that too to get it possibly to work on N900. Atleast with maemo leste. Seems they really try to secure things. For me startmail is just so that I got rid off unwanted advertisements and that is the reason I use only prepaid phonenumber. Mail costs about 40eur per year and prepaid is about 10eur more per month extra compared to normal but it has been worth it.