OutboxWatch

OutboxWatch reads a sending domain's public DNS and checks SPF (including the 10-lookup limit and duplicate records), DKIM on common or custom selectors, DMARC, MX and domain blocklists such as Spamhaus DBL and SURBL, then explains each problem and how to fix it in plain English. The checker is free with no signup, and a free weekly email report covers one domain every Monday. Paid plans re-check domains daily and alert when something breaks. It is not a sending tool, warm-up service or inbox-placement test.