Addresses checked: 162.255.119.61 (web), 104.219.250.36 (web), 2.59.170.19 (web), 176.119.200.128 (mail, mail.protonmail.ch), 185.205.70.128 (mail, mail.protonmail.ch), 185.70.42.128 (mail, mail.protonmail.ch).
We check the web server and mail server IP addresses against free spam and malware blocklists. A listing usually means spam or malware was seen recently — follow the list’s own process to be removed.