---
title: "Free Email Tools | Tenant Migration"
description: "A dozen free DuoCircle tools in one place: DMARC Report Analyzer, SPF/DKIM/BIMI/MTA-STS checkers and generators, an email header analyzer, and a domain authentication audit. Free, no signup."
image: "https://tenantmigration.com/images/og-default.png"
canonical: "https://tenantmigration.com/tools/"
---

Free tools 

# The free tools, in one place 

A dozen free tools across the DuoCircle family of products. DMARC, SPF, DKIM, BIMI, MTA-STS, an email header analyzer, and a domain authentication audit that runs the lot in one pass. Hosted on the canonical product sites, used by tens of thousands of organizations every month, free with no signup.

[ Browse the tools → ](#dmarc-tools) [ See the product family ](https://www.duocircle.com/products/) 

DMARC, DKIM, BIMI, MTA-STS 

 Authentication tooling hosted on DMARC Report, the multi-region G2 Category Leader for DMARC software. 

[ DMARC Report Analyzer Most useful Drop a DMARC aggregate report (RUA XML or .gz) and see senders, alignment, pass rates, and per-record detail. Parsed entirely in your browser. dmarcreport.com Open tool ](https://dmarcreport.com/tools/dmarc-report-analyzer/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory)[ DMARC Record Checker Look up the DMARC record on any domain and see policy, alignment mode, and report destinations. dmarcreport.com Open tool ](https://dmarcreport.com/tools/dmarc-checker/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory)[ DMARC Record Generator Build a syntactically correct DMARC record for any domain. Walks through policy, percentage, and reporting addresses. dmarcreport.com Open tool ](https://dmarcreport.com/tools/dmarc-record-generator/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory)[ DKIM Lookup Resolve a DKIM selector and inspect the public key and any policy attributes published in DNS. dmarcreport.com Open tool ](https://dmarcreport.com/tools/dkim-lookup/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory)[ BIMI Checker Verify BIMI publication on a domain. Validates the BIMI record, fetches the SVG, and reports VMC presence. dmarcreport.com Open tool ](https://dmarcreport.com/tools/bimi-checker/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory)[ MTA-STS Checker Check that a domain publishes a valid MTA-STS policy and that the policy is reachable over HTTPS. dmarcreport.com Open tool ](https://dmarcreport.com/tools/mta-sts-checker/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory)[ Domain Authentication Checker Run SPF, DKIM, DMARC, BIMI, and MTA-STS in one pass. The full authentication snapshot for a domain. dmarcreport.com Open tool ](https://dmarcreport.com/tools/domain-auth-checker/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory) 

Mail flow diagnostics 

 One-off forensics for the times when a specific message arrived late, looks suspicious, or did not arrive at all. Hosted on Mailflow Monitoring. 

[ Email Header Analyzer Paste raw email headers and instantly see the full delivery path with per-hop time delays, plus SPF, DKIM, and DMARC results. Parsed entirely in your browser. mailflowmonitoring.com Open tool ](https://mailflowmonitoring.com/tools/email-header-analyzer/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory) 

SPF 

 SPF tooling hosted on AutoSPF, the SPF management product built because the established vendor would not scale to a $4 per month customer. 

[ SPF Record Lookup Fetch and pretty-print the SPF record for any domain. Shows includes, redirects, and the resolved sender list. autospf.com Open tool ](https://autospf.com/tools/spf-record-lookup/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory)[ SPF Checker Validate that an IP or sender is permitted by a domain SPF record. Shows the include chain that grants or denies. autospf.com Open tool ](https://autospf.com/tools/spf-checker/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory)[ SPF Validator Check an SPF record for syntax errors, lookup-count overruns (the 10-DNS-lookup limit), and policy ambiguity. autospf.com Open tool ](https://autospf.com/tools/spf-validator/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory)[ SPF Record Generator Build a valid SPF record from your sender list. Flags 10-lookup-limit risks before you publish. autospf.com Open tool ](https://autospf.com/tools/spf-record-generator/?utm%5Fsource=tenantmigration&utm%5Fmedium=tools%5Fdirectory) 

Why these live on the product sites 

## Use them as long as they fit, upgrade when you outgrow the free tier

Every tool above runs on the product site that owns the capability. The DMARC tools live on dmarcreport.com because that is where the paid product runs. The SPF tools live on autospf.com because that is where AutoSPF runs. Use the tools as long as you want, free, no signup. When the free version stops scaling, the paid product is one click away on the same site.

We do not gate the tools, we do not require an email, and we do not store the data you put through them. The DMARC Report Analyzer and Email Header Analyzer in particular parse your data entirely in your browser. Open DevTools and watch the Network tab if you want to verify it.

## Need more than the free tier?

Same-day response from someone technical. We tell you yes or no quickly. If yes, we get to work.

[Talk to an expert→](https://www.duocircle.com/contact/)[See the product family](https://www.duocircle.com/products/)

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```

```json
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```

```json
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```