DKIM Monitor

DKIM Monitor automatically validates DKIM records by querying the domain's DNS for the selector._domainkey TXT record, parsing the DKIM fields, and assessing essential correctness. It is designed for email administrators, security engineers, and DevOps teams responsible for mailbox deliverability. Typical use occurs during domain onboarding, after DKIM key rotation, and for ongoing deliverability monitoring to catch drift before it affects inbox placement.
Conceptually, the tool performs DNS lookups, confirms the v=DKIM1 tag, analyzes the public key relationship, and tests header-body alignment against canonicalization rules. It records each check with timestamps, stores results for trend analysis, and flags discrepancies such as missing records, multiple conflicting records, or expired keys.
Unique value lies in continuous monitoring, historical health scoring, and automated diagnostics that translate technical DKIM signals into actionable guidance. Optional advanced features include multi-domain aggregation, alerting via email or webhooks, and exportable diagnostics suitable for audits. The approach emphasizes correctness, consistency, and resilience against misconfigurations that degrade deliverability.
Typical use cases include onboarding new domains, validating changes after selector updates, verifying key rotation schedules, and supporting security reviews of outbound email flows for marketing and transactional channels.