Addresses checked: 104.21.72.176 (web), 172.67.153.85 (web), 179.43.172.61 (web), 35.161.157.106 (mail, inbound-smtp.us-west-2.amazonaws.com), 52.13.163.116 (mail, inbound-smtp.us-west-2.amazonaws.com), 52.43.162.244 (mail, inbound-smtp.us-west-2.amazonaws.com), 54.188.121.70 (mail, inbound-smtp.us-west-2.amazonaws.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.