Addresses checked: 15.197.148.33 (web), 3.33.130.190 (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), 176.119.200.129 (mail, mailsec.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.