3 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Change watch for spf authorizes marketo: runs the check, compares it with the result from your previous call for the same domain (kept 90 days) and returns the current answer, changed true/false, the fields that changed...
DKIM public key for selector "marketo" of a domain: looks up marketo._domainkey.<domain> (TXT, Cloudflare DoH) and parses v=, k=, key type, public-key length, testing flag and whether the key is revoked (empty p=). Confi...
Does the domain's SPF record authorise marketo to send its mail? Reads the SPF TXT record (Cloudflare DoH) and checks for marketo's include/ip mechanisms, returning yes/no, the matching mechanism and the full record. Con...