Free tool
DMARC record checker.
DMARC ties SPF and DKIM together and tells receivers what to do with spoofed mail. Gmail and Yahoo now require it for bulk senders. Enter a domain to look up its policy and reporting.
Built for the bulk-sender rules
CogniLead ships RFC 8058 one-click unsubscribe, suppression, and a reputation circuit-breaker — the deliverability bar Gmail and Yahoo now enforce. You bring the leads.
Also try the SPF checker.