Addresses checked: 104.21.62.22 (web), 172.67.218.160 (web), 18.139.153.173 (mail, mx1.larksuite.com), 101.126.58.223 (mail, mx3.larksuite.com), 122.14.230.154 (mail, mx3.larksuite.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.