NodeJS Forward-confirmed reverse DNS
Haraka plugin that checks a remote for Forward Confirmed reverse DNS
Haraka plugin that implements greylisting
Reverse DNS lookup with promises.
Increase the reputation of recognized sender domains.
Domain security reconnaissance MCP server — 13 tools for AI agents. DNS, SSL, HTTP headers, email auth, port scan, ASN, RDAP and more. Free, no API key.
SMTP anti-spam primitives: DNS blocklist (DNSBL) queries, greylisting policy with optional in-process kevy store, and PTR / forward-confirmed reverse DNS (FCrDNS) checks.
DNS utilities for SMTP servers
Email-domain DNS health checks: MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, BIMI, DANE, PTR — async, zero I/O outside the resolver.