Free Email Deliverability Tools
11 tools for SPF, DMARC, blacklists, headers, signatures, and more. Built by the Review My Emails team.
Not sure where to start? Pick what's wrong.
Tap one. We'll point you at the right tool.
What "deliverability" actually means
Every legitimate email you send competes with billions of spam messages for inbox placement. Whether yours lands in the inbox, the promotions tab, the spam folder, or never arrives at all depends on three layered signals: authentication (does the receiver trust the message came from you), reputation (does your sending domain or IP have a clean record), and content quality (does the message look like something a human would want to read).
The tools on this page check those signals. Authentication tools like SPF, DMARC, and MTA-STS verify your DNS setup. The Blacklist Checker watches your reputation. The Header, Source, Signature, Accessibility, and Subject Line tools surface the content-quality issues most senders never look at.
You can run any tool on its own. Or pick the one that matches your problem from the diagnostic above and follow the "up next" links to the natural follow-on.
Authentication & DNS
Verify your domain's email authentication setup and DNS records.
DMARC Report Analyzer
Upload DMARC aggregate XML files and see which sources are authenticated, need attention, or may be spoofing your domain.
FreeDMARC Record Generator
Create your DMARC record in under 2 minutes. Answer 5 questions and get a ready-to-copy DNS record.
FreeDMARC Record Checker
Check any domain's DMARC record. Validate the policy, alignment settings, and reporting configuration.
FreeSPF Record Checker
Validate any domain's SPF record. Count DNS lookups against the 10-lookup limit and identify authorized services.
FreeMTA-STS & TLS-RPT Checker
Check your MTA-STS policy and TLS reporting setup. Validate DNS records and policy file configuration.
Reputation & Monitoring
Monitor your sending reputation and decode email internals.
Email Blacklist Checker
Check if your domain or IP is listed on 12+ major blacklists including Spamhaus, Barracuda, and SpamCop.
FreeEmail Header Analyzer
Paste email headers or upload an .eml file to see what every header means in plain English.
FreeEmail Raw Source Analyzer
Paste the full raw source of any email to decode authentication, routing, tracking pixels, and spam signals.
Content & Design
Test your email content, signatures, and accessibility before you send.
Subject Line Tester
Check for spam trigger words, preview rendering across Gmail, iPhone, and Outlook, and get a deliverability score.
FreeEmail Signature Analyzer
Paste your signature HTML and check for deliverability red flags like HTML weight, image count, and link density.
FreeEmail Accessibility Checker
Check your email HTML against WCAG standards. Get scores for alt text, contrast, structure, and dark mode.
Google or Yahoo just told you to set up DMARC?
Since February 2024, Google and Yahoo require DMARC for any sender mailing more than about 5,000 messages a day to their inboxes. If you got the notice and have no idea what DMARC is, we wrote a plain-English walk-through that gets you from "what is this" to a working record in under 15 minutes.
Google says I need DMARC. What do I do? →