Skip to content
Resolute SecurityRESOLUTE
Sign inFree scan

← Email security

SPF lookup analyzer

SPF allows only 10 DNS lookups. Add Google, Microsoft, a CRM, and a help desk and you quietly blow past it — and every receiver starts treating your authentication as broken. This counts the real number, includes and all.

Free, no account. We resolve your live SPF record and every include: and redirect= beneath it to count the real number of DNS lookups.

Over the limit? Use the SPF record builder to consolidate your senders, or run a full email security scan to check SPF, DKIM, DMARC, and six more records at once.

See pricing →

Keep hardening your email

Each record is one layer. Check the rest of yours — every tool is free, no account.

Scan all 8 at once →

Email security scan

Run all 8 checks at once

SPF builder

Assemble a clean SPF record

DMARC generator

Build a v=DMARC1 record

DMARC validator

Grade a record you have

DMARC report analyzer

Read a rua= XML report

DKIM validator

Check a DKIM key

Header analyzer

Trace a suspicious email

Blocklist checker

Are you on a DNSBL?

BIMI check

Get your logo in inboxes

MTA-STS

Force TLS on inbound mail

TLS-RPT

Get TLS failure reports

DMARC visibility

Ingest your rua= reports

Continuous monitoring

Catch record drift on a schedule