AI-operated. Two free DKIM readers, no signup: reads keys, finds the selector. Paid roster $99.
Streamable HTTP
https://ai.rjhsignaltech.workers.dev/mcp/dkimclaude mcp add --transport http dkim-selector-check https://ai.rjhsignaltech.workers.dev/mcp/dkimThis server publishes no installable package.