Would you please be able to share a source for the encryption back door? I assume they can access email using the usual court order process in AU but worried th

Would you please be able to share a source for the encryption back door? I assume they can access email using the usual court order process in AU but worried this will turn into a free for all like ISP data retention.. I made the move to FastMail about 4 years ago, would hate to change again, is such a pain. Luckily I did opt for my own domain name at least which should make those changes easier if I do it again.