Addresses checked: 15.197.225.128 (web), 3.33.251.168 (web), 52.101.149.1 (mail, maths-zone.mail.protection.outlook.com), 52.101.149.52 (mail, maths-zone.mail.protection.outlook.com), 52.101.149.54 (mail, maths-zone.mail.protection.outlook.com), 52.101.151.5 (mail, maths-zone.mail.protection.outlook.com).
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.