Domain Reputation: What It Is, How to Check It and How to Fix It
Domain reputation decides whether Gmail and Outlook trust your email. How to check it for free, what raises and lowers it, and how to fix a bad one.
The short answer: Domain reputation is how much Gmail, Outlook and Yahoo trust email from your domain, based on how people react to it. Check it for free with Google Postmaster Tools (spam rate and compliance), Cisco Talos and the Spamhaus Reputation Checker. Fix a bad one by stopping cold sends, cleaning the list and restarting slowly with warmup.
What is domain reputation?
Domain reputation is a mailbox provider's running judgment of your sending domain. Gmail describes its levels by your history: a "High" domain has "very low spam rates" and follows its sender guidelines, while a "Bad" one has a "history of sending a high volume of spam regularly" (Google). The better the reputation, the more of your email reaches the inbox instead of spam.
Reputation follows the domain, not the tool you send from. Switching cold email software doesn't reset it.
Domain vs IP vs inbox reputation
Type | What it tracks | Who controls it | How much it matters for cold email |
|---|---|---|---|
Domain reputation | Your sending domain (the one in DKIM and SPF) | You | The main factor, and it follows you everywhere |
IP reputation | The server address that sends the email | Google or Microsoft, if you send from Workspace or Microsoft 365 | Mostly out of your hands on shared mailbox providers |
Inbox reputation | One mailbox's own history | You | Smaller, but a bad inbox can drag down its domain |
What raises and lowers domain reputation
Providers judge your domain by how people react to your email and whether it's set up correctly. Spam reports do the most damage; replies help the most.
Raises it | Lowers it |
|---|---|
Replies and real conversations | Spam reports (Google says keep them under 0.10%, never 0.30%) |
SPF, DKIM and DMARC passing | Missing or failing authentication |
Steady, predictable volume | Sudden volume spikes |
Low bounce rates from a verified list | Bounces from old or bought lists |
Emails that get opened and kept | Emails deleted unread or ignored |
A clean blocklist record | Spam trap hits and blocklist listings |
Why new domains are fragile
A new domain has no history, so a provider has little to go on and a few spam reports weigh heavily. That's why new sending domains need warmup and a slow ramp before cold email. See our email warmup schedule.
How to check your domain reputation
No single tool gives one universal score. Check the provider data first, then blocklists, then your own numbers.
Tool | What it shows | Cost | Note |
|---|---|---|---|
Gmail spam rate, compliance status, authentication, delivery errors; domain and IP reputation in the old view | Free | Google says the Domain and IP Reputation dashboards "are slated to be retired" and a new version is coming | |
Good, Neutral or Poor for a domain or IP | Free lookup | "Poor" means email "is likely to be filtered or blocked" | |
Whether your domain or IP is listed, why, and how to request removal | Free | A listing can block email at many providers at once | |
Outlook.com data for IPs you control | Not stated | IP-based only; rarely useful if you send from Microsoft 365 or Workspace | |
Your own campaign numbers | Reply rate, bounce rate, spam reports, sudden drops | Free | Often the first warning sign |
What Google Postmaster Tools shows now
Google has moved Postmaster Tools to a new version (v2). Every old dashboard is in it except Domain Reputation and IP Reputation, which Google says "are slated to be retired", with a replacement on the way (Google transition notice). Until then, watch two things:
Spam rate: the share of your emails people mark as spam. Keep it under 0.10%.
Compliance status: marks each Gmail requirement Compliant, Needs work or No data found.
A domain that sends little to Gmail may see "No data found" on some checks; that's a lack of data, not a bad result.
Signs your domain reputation is dropping
Reputation rarely collapses overnight; it shows up in your numbers first. Watch for these:
Replies fall sharply on a campaign that used to work
Test emails land in spam or promotions at Gmail or Outlook
Spam rate in Postmaster Tools climbs toward 0.10%
Compliance status shows "Needs work"
Talos moves from Good to Neutral or Poor
Bounces arrive with 4xx deferrals or 5xx rejections that mention spam or policy
The domain appears on a Spamhaus listing
How to fix a damaged domain reputation
Stop the damage first, then rebuild slowly. Pushing more email through a damaged domain makes it worse.
Pause cold email from the domain. Keep warmup running, if you use it, but stop campaigns.
Find the cause. Check spam rate, bounce rate, recent list sources, volume changes and blocklists. One cause usually stands out.
Fix authentication. Make sure SPF, DKIM and DMARC all pass. See SPF, DKIM and DMARC explained.
Clean the list. Remove bounces, role addresses and anyone who hasn't engaged. Verify the rest before sending again.
Request removal from any blocklist once the cause is fixed. Spamhaus's checker shows the reason and the removal steps. See our blacklist removal guide.
Restart small. Send to your most engaged contacts first at low volume, then raise it each week while spam rate and bounces stay low.
In our experience, recovery takes weeks, not days (Alien Mail's guidance: usually 2 to 6 weeks of clean, low-volume sending). No provider publishes a recovery timeline. Google says to allow up to 7 days for spam rates to fall after you fix the cause.
When to retire a domain instead
A secondary cold email domain is cheap to replace, so don't spend months rescuing one. Retire it if it stays on a blocklist after removal requests, Talos still rates it Poor after a month of clean sending, or test emails still land in spam after the steps above. Never retire your main business domain; fix it.
How to protect your main domain
Send cold email from separate secondary domains, never from the domain your team and customers use. If a secondary domain's reputation drops, your invoices, support replies and team email keep reaching the inbox. A subdomain doesn't give the same protection: Google counts messages from subdomains together with their primary domain for its sender rules. See secondary domains for cold email.
Protect your reputation with Alien Mail
Alien Mail warms every connected inbox for free, checks SPF, DKIM and DMARC before you send, verifies your list and spreads sending across inboxes so no single one spikes. You pay only for cold emails sent, starting with 100 free credits and no card.
Start free → · How Alien Mail warmup works
Frequently asked questions
What is a good domain reputation? In Gmail's terms, "High": very low spam rates and following its sender guidelines. In practice: a Gmail spam rate under 0.10%, Compliant status in Postmaster Tools, no Spamhaus listing and a Good or Neutral rating at Talos.
How do I check my domain reputation for free? Use Google Postmaster Tools for Gmail spam rate and compliance, Cisco Talos for a Good, Neutral or Poor rating, and the Spamhaus Reputation Checker for listings. Add a test send to a few seed inboxes at Gmail and Outlook.
Does Google Postmaster Tools still show domain reputation? In the old view, yes. Google says the Domain and IP Reputation dashboards are slated for retirement and a new Reputation dashboard is coming. Watch spam rate and compliance status in the meantime.
How long does it take to fix domain reputation? Usually weeks. Alien Mail's guidance is 2 to 6 weeks of clean, low-volume sending. Google says spam rates can take up to 7 days to fall after you fix the cause. A badly damaged secondary domain is often cheaper to replace.
Is domain reputation more important than IP reputation? For cold email sent from Google Workspace or Microsoft 365, yes. They manage the sending IPs, so the reputation you control is your domain's.
Does changing my email tool reset domain reputation? No. Reputation belongs to the domain, not the software or IP you send from.
Will cold email hurt my main domain's reputation? It can, if you send cold email from it. Use separate secondary domains so any damage stays away from your main domain.
Key terms
Domain reputation: how much mailbox providers trust email from your domain.
IP reputation: the same judgment for the server address that sends your email.
Spam rate: the share of delivered emails that recipients mark as spam.
Blocklist: a public list of domains or IPs flagged for spam, used by many providers.
Secondary domain: a separate domain used only for cold email, to protect the main one.
