#Tutanota or #ProtonMail does not allow signing up via #Tor. Well, if you use #Bitmessage, try the following: Right-click on your BM address and set up a free email account at the #Mailchuck email Gateway. Once you received your confirmation, fire up #Tor Browser. Visit mailfence.com and use your Mailchuck email address to register. Voilà, now you have a free email account, usable with Tor Browser.