Email tools
MX, SMTP, SPF, DKIM, DMARC, blacklists
Email blacklist (RBL) check
Query 16+ public RBLs in parallel — Spamhaus, Barracuda, Spamcop, SORBS, more.
DKIM tester
Look up DKIM keys for any selector. Auto-tries common selectors.
DMARC tester
Parse the DMARC record, classify policy, list aggregate/forensic recipients.
Email auth all-in-one
SPF + DKIM + DMARC + BIMI + MTA-STS + TLS-RPT in a single shot.
MX lookup
Resolve mail-exchange records, sort by priority, banner-test SMTP.
SMTP test
Connect, EHLO, STARTTLS, capture banner & supported extensions.
SPF tester
Inspect, validate, expand a domain's SPF record. Lookup-budget aware.