Yes. Free, no sign-up, and nothing is saved.

FREE TOOL BY WARMY.IO

Domain Reputation Checker

Q: How is this grade calculated?

From public signals: blacklist listings for your domain and its mail server IPs, your SPF, DKIM and DMARC setup, MX health and domain age. Each issue lowers the score, and the results show which ones are pulling it down and how to fix each.

Q: Is this the same as Google Postmaster reputation?

No. Postmaster Tools shows Gmail's private view, built from how recipients react to your actual mail, and only the domain owner can see it. This grade uses signals anyone can check. Fix these first, because Gmail's view rarely recovers while the public basics are broken.

Q: Why does domain age matter?

Spammers register domains, burn them and move on, so providers treat brand-new domains with caution. A domain younger than about 30 days has no history at all and should be warmed up slowly before it carries real volume.

Q: How do I improve my domain reputation?

Fix every issue listed, request removal from any blacklists, and build positive engagement with gradual warm-up.

Q: What is a good domain reputation score?

On this checker, an A or B means the public basics are in place: no major listings, working authentication and a domain with some history. That's the foundation, not a guarantee of inbox placement. Gmail and Outlook still weigh how your recipients engage, so a domain with a clean grade can land in spam if people ignore or report its mail. Use the grade to catch technical problems early, and track real placement with a deliverability test.

Q: How do I check my domain reputation in Gmail?

Add and verify your domain in Google Postmaster Tools. Once you send enough mail to Gmail users, it shows your spam rate and whether you meet Google's sender requirements. Warmy's Google Postmaster integration pulls that data into the same dashboard as your warm-up and placement results.

Q: How long does it take to improve domain reputation?

If the problem was technical, such as a missing DKIM record or a single listing, you can see improvement within days of fixing it. Rebuilding trust after spam complaints or a period of poor engagement usually takes several weeks of steady, wanted mail.

Enter any domain and get an instant reputation grade from public signals: blacklists, authentication, DNS health and domain age, with what's dragging the score down.

✓Instant A–F grade
✓Blacklists + authentication
✓No sign-up needed

4.9/5 on G2Trusted by 7,000+ businesses

Trusted by teams that live in the inbox

7,000+

Businesses warming up with Warmy

4.9/5

Average rating on G2

98%

Average inbox placement reached

24/7

Human deliverability support

How it works

Where every deliverability fix starts

01
Enter your domain
We gather every public reputation signal in one pass.
02
Blacklists
Your domain and its IP checked against major blocklists.
03
Authentication
SPF, DKIM, DMARC and mail servers validated.
04
Domain age
New domains need warm-up before they can send.

What shapes your domain reputation and how to read your grade

Domain reputation is the trust score mailbox providers keep for every domain that sends them mail. Gmail, Outlook and Yahoo don't publish it, but they use it on every message to decide between inbox, spam folder and rejection. The domain reputation checker above estimates it from the public signals anyone can see and turns them into an A to F grade.

The signals behind your domain reputation score

The grade combines six checks. Blacklists come first, for the domain and for the IPs its mail servers use, since a listing on a major list weighs more than any other single signal. SPF, DKIM and DMARC follow: a domain that can't prove who sends for it gets less trust from the start, and DMARC at quarantine or reject counts more than p=none. MX records show the domain can receive replies. Domain age matters because spammers burn through new domains, so a domain registered last month starts with a handicap and needs warm-up before real volume. Each failed check comes with the fix that raises the grade.

Domain reputation vs IP reputation

IP reputation belongs to the server that sends your mail. Domain reputation follows your domain wherever you send from. Gmail leans heavily on domain reputation, which is why switching email platforms rarely fixes a damaged domain. If you share IPs with other senders on your email platform, their behaviour affects your IP reputation, while your domain reputation is yours alone. Sender Score from Validity is a third, separate metric, measured for IP addresses on a 0 to 100 scale.

What a public domain reputation check can't see

Mailbox providers also judge you on data only they hold: how many recipients open, reply, delete unread or mark you as spam, and whether you hit their spam traps. That's why a domain with a strong public grade can still land in spam. To see Google's side, use Google Postmaster Tools, which reports your spam rate and compliance status, and Microsoft SNDS for IP data. Our guide to factors that affect domain reputation covers the full list.

How to improve your domain reputation

Fix every failed check first, starting with blacklists and authentication. Then rebuild the engagement side: send to people who expect your mail, remove inactive contacts and keep volume steady. Warm-up speeds this up, because real mailboxes open and reply to your emails and move them out of spam. Recovery usually takes several weeks, and our guide on fixing bad IP and domain reputation in Google Postmaster shows what to watch along the way.

Next step after you get your grade

A and B grades: protect them with daily monitoring and warm-up. C or lower: start with the Blacklist Checker, or hand the whole fix list to our reputation repair team. Warmy tracks domain and IP reputation, imports your Postmaster data and warms up your mailboxes so the grade keeps rising.

Hand the fix list to Adeline. Start a 7-day trial and let Warmy's AI repair your reputation, or book a demo.

Get a 7-Day Trial Book a Demo

Why Warmy

Everything Deliverability
In One Platform

One platform, one subscription, one team, no add-ons, no extra vendors.

Scale & people

1M+ real mailboxes - The largest warm-up network — genuine Workspace, Microsoft 365 and consumer inboxes.
A dedicated success manager - A named expert who owns your placement outcomes, not a ticket queue.
24/7 support, VIP channels - Real people any hour, in your own Slack, WhatsApp or Teams channel.
120+ deliverability specialists - The largest team in the category, dedicated to inbox placement.
An in-house research team - Continuous experiments on how Gmail, Outlook and Yahoo filter this month.
Recognised experts - Specialists who advise on sender reputation daily — not generalists.

Technology

Adeline AI co-pilot - Reads your tests, DNS and warm-up data, then tells you what to fix next.
The infrastructure behind other tools - Outreach platforms and ESPs run their warm-up on our API.
One loop: test, warm, fix - Placement tests, warm-up, monitoring and fixes in a single platform.
500K+ US seed accounts - Real inboxes across major, corporate and regional providers — mobile included.
Monthly seed rotation - Aging mailboxes retire automatically, so your data comes from live inboxes.
Automation built in - n8n, Zapier, Make and a documented API — no CSVs, no manual seed files.

Included in every plan

Email verification - Clean lists before you send, so bounces never cost you reputation.
DMARC tracker - SPF, DKIM and DMARC monitoring with the exact record to change.
Deliverability tester - Instant placement, authentication and blacklist check for any sender.
Templates AI optimizer - Your campaign scored and rewritten for the inbox before you send.
Reputation tracker - Domain and IP reputation with blacklist alerts the moment a signal drops.
Google Postmaster built in - Postmaster data beside your warm-up and placement results.
Working-hours warm-up - Natural business-hours sending in the recipient’s time zone.
A robust API - Every feature available over documented endpoints.

No extra vendors, no add-on fees, no separate contracts.

Loved By Thousands Of Marketers Around The World

Over 7,000 Businesses Trust Warmy

FAQ

Domain Reputation
Questions, Answered

What is domain reputation?

It's how mailbox providers like Gmail and Outlook judge the mail coming from your domain. That judgment decides whether a message lands in the inbox, goes to spam or gets refused.

How is this grade calculated?

Is this the same as Google Postmaster reputation?

Why does domain age matter?

How do I improve my domain reputation?

Is the check free?

What is a good domain reputation score?

How do I check my domain reputation in Gmail?

How long does it take to improve domain reputation?

Get started

Hand The Fix List To Adeline.
Warmy's AI Repairs Your Reputation For You

Get a 7-Day Trial Book a Demo

No Credit Card Required | Cancel Anytime

Keep going

More Free Tools

Everything you need to send emails that look great and land in the inbox.

4.9/5 on G2

Recognized By The People Who Use Us

Award-winning on G2, season after season

A white and teal triangle with black text.

Domain Reputation Checker

Where every deliverability fix starts

Enter your domain

Blacklists

Authentication

Domain age

What shapes your domain reputation and how to read your grade