Mail Provider Lookup
Identify who actually handles mail for a domain.
One engine, two surfaces
This tool runs the same check the monitor runs on a schedule. The difference is not the answer — it is that the monitor keeps asking, notices when the answer changes, and tells you what to do about it. All 41 checks and 34 blacklists are covered by the full scan.
More tools
Resolve and validate an SPF record, including the 10-lookup limit.
DKIM LookupFind and inspect DKIM public keys on any selector.
DMARC LookupRead a DMARC policy and judge how much it actually protects.
MX LookupList mail exchangers with priorities and resolved addresses.
BIMI LookupCheck a BIMI record and whether its logo and VMC qualify.
PTR LookupReverse-resolve a sending IP and check forward-confirmed rDNS.
Deliverability breaks between checks
MailVitals re-runs every check on a schedule and tells you the moment an answer changes — with the fix attached. One domain free, forever.