OutboxWatch

OutboxWatch is a domain health checker for people who send cold email. Enter a domain and it reads public DNS to check SPF (including duplicate records and too many lookups), DKIM on common selectors or your own, DMARC policy, MX, and domain blocklists such as Spamhaus DBL, SURBL and URIBL, with a plain-English fix for each problem. A free header analyzer shows whether SPF, DKIM and DMARC passed and aligned. The checker is free with no signup and no mailbox access. Paid plans ($29 to $149/mo) re-check your domains every day and email you when something breaks.