Blacklist check
See if your domain or mail server IPs appear on common spam and DNS blocklists.
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What is a blacklist check used for?
Blacklist check looks up public spam and reputation lists for your domain or sending IP. If customers suddenly stop receiving invoices or Microsoft 365 outbound mail bounces with reputation errors, this is the first place to look before rebuilding mailboxes.
Does a listing always mean you were compromised?
Not always — shared hosting IPs and misconfigured forwarders can drag clean domains onto lists. The tool tells you whether a listing exists so you can request delisting or move sending to a cleaner path with clear evidence.
Guides
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