Domain reputation dies in increments: a DKIM selector accidentally removed, a new MX added during a migration, an IP landing on Spamhaus because a mail-list member got compromised. Without monitoring you find out via placement dropping a week later.
- SPF record (content + includes + lookup count).
- DKIM public key presence for your active selectors.
- DMARC policy, reporting targets, sub-policy.
- PTR for your sending IP(s).
- MX, A, AAAA records (unexpected changes).
- MTA-STS and TLS-RPT publication.
- Major blacklists: Spamhaus, Spamcop, SURBL, Barracuda, SORBS, URIBL.
- Domain expiration.
Alerts
- Email on change (instant).
- Slack/Teams webhook (on paid plan — free via Zapier through our OAuth).
- Weekly digest (free, opt-in).
- MCP tool:
monitor_domain— an agent can subscribe and fetch state.
Why “free” is harder than it sounds
Domain monitoring is resource-intensive. DNS queries are cheap individually, but done daily across many domains + blacklists + selector rotation adds up. Most competitor tools bundle this as a paid add-on because the infrastructure cost is non-trivial.
We run it free because we already maintain the DNS/auth/blacklist infrastructure for placement tests — domain monitoring rides on top at near-zero marginal cost. You benefit from the scale.
Add your sending domain and receive the first report within 24 hours. No credit card, no trial.