Hey there, According to my knowledge the only check protonmail performs is a GeoIP-Filter which can be disabled in the web app settings. (1) If your authentication logs are set to basic or advanced, this may be a reason for the challenge. If they really believe in what's written on their about-page they should be Tor-friendly too ;)
Kind Regards, Andre Mankel -- (1) Settings -> Security (https://mail.protonmail.com/security) -- tor-talk mailing list - [email protected] To unsubscribe or change other settings go to https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-talk
