Blacklist check

Check an IPv4 address or domain against selected DNS blocklists. Domains check MX server IPs, falling back to domain A records when no MX exists.

Provider information: SpamCop · Mailspike · PSBL · DroneBL · UCEPROTECT. No account or API key required. Provider usage limits still apply. UCEPROTECT L2/L3 cover whole networks/providers; a listing does not necessarily mean your server sent spam.