Email Security

SPF Analyzer

Analyze SPF, count DNS lookups, and highlight settings that can break mail delivery.

What is SPF Analyzer for?

SPF Analyzer breaks down SPF mechanisms, counts DNS lookups, and highlights settings that can make SPF fail or exceed the 10-lookup limit.

Recommended workflow

  1. Enter the domain whose SPF record you want to analyze.
  2. Review each SPF mechanism, DNS lookup count, and configuration warning.
  3. Adjust include, redirect, or IP ranges if the SPF record is too long or fragile.

How this tool works

SPF data is read from TXT records that start with v=spf1, then mechanisms such as include, ip4, ip6, a, mx, exists, all, and redirect are inspected. The goal is to reveal lookup cost, policy intent, and common mistakes that affect sender authentication.

Part of this tool group

Open nearby tools in the same group to cross-check, inspect deeper, or complete a small workflow.

Open Email Security hub

Frequently asked questions

How many DNS lookups can SPF use?

SPF allows up to 10 DNS lookups for mechanisms such as include, a, mx, ptr, exists, and redirect.

A few nearby utilities you can open quickly when you need to check more.

More in Email Security View all tools

MX Lookup

Shows the mail servers receiving email for a domain and resolves each MX target IP for mail routing checks.

Open tool

SPF Lookup

Extracts SPF records from TXT records to identify which sources may send mail for a domain.

Open tool

DKIM Lookup

Looks up a DKIM public key by selector to help verify email signing configuration for a domain.

Open tool

DMARC Lookup

Looks up the DMARC record at _dmarc to review how a domain handles spoofed or unauthenticated mail.

Open tool

DMARC Analyzer

Reads DMARC policy, SPF/DKIM alignment, pct, rua/ruf, and key settings for anti-spoofing reviews.

Open tool

Email DNS Health Check

Reviews MX, SPF, DKIM, DMARC, MTA-STS, and TLS-RPT for a domain in one consolidated table.

Open tool