DMARC adkim= tag for a domain: DKIM alignment mode (r relaxed / s strict). Reads _dmarc.<domain> (Cloudflare DoH), parses the record and returns the adkim value (or that it is absent, with the default that then applies) plus the full record. Precise single-answer check for compliance scripts. $0.01 per lookup.
https://email.intel.rallylive.ca/email/dmarc/adkim