not sure hushmail would be the best they have already busted different ugls and labs because hushmail saved all their emails and sent them to the feds in the US. by law pretty much all encrypted email service sor "private email sources" will give the feds your emails if they ask for them no matter what country the server is in.
"A September court document (.pdf) from a federal prosecution of alleged steroid dealers reveals the Canadian company turned over 12 CDs worth of e-mails from three Hushmail accounts, following a court order obtained through a mutual assistance treaty between the U.S. and Canada. The charging document alleges that many Chinese wholesale steroid chemical providers, underground laboratories and steroid retailers do business over Hushmail"
Encrypted E-Mail Company Hushmail Spills to Feds | Threat Level | Wired.com