Free mail tester
Mail tester: check the spam score of your emails
First, send your email to:
Works for 1 hour · up to 3 emails · report kept 24 hours
How it works
Send one real email. Get a score out of 10.
- 01
Copy your test address
Every visit gets a one-time address. It works for one hour and accepts up to three emails.
- 02
Send your real email to it
Use the tool you send with: a Lumail test send, your ESP, or your mailbox. Forwarding breaks the authentication results.
- 03
Get your score out of 10
The report opens in seconds, with every problem explained and a link to fix it.
What the test checks
Everything an inbox looks at before your subscriber does.
The test reads the email the receiving server actually got, not a preview, so the results match what Gmail and Outlook see.
Authentication
SPF, DKIM and DMARC as the receiving server sees them, and whether they align with your From domain.
Spam content
Nearly 200 English and French trigger words, weighted, plus the provider’s own spam scan.
Formatting
Capitals, stacked exclamation marks, image-only layouts, scripts, forms and Gmail’s 102 KB clipping.
Blocklists
Your From domain and every linked domain against the Spamhaus Domain Block List, plus reverse DNS.
Unsubscribe
The List-Unsubscribe and one-click headers Gmail and Yahoo require from bulk senders.
Broken links
Up to ten links opened from our servers. Unsubscribe and confirmation links are never opened.
Improve your score
Fix what the mail tester flags, then test again.
Most low scores come from the same six problems. Each one has a fix you can make in a few minutes.
SPF fails
List every service that sends for your domain in one SPF record, with at most 10 DNS lookups.
Check your SPF recordDKIM is missing or unaligned
Sign with a key published on your own domain, not your provider’s, so DKIM aligns with your From address.
Check your DKIM selectorDMARC is missing
Publish p=none to start getting reports, then move to quarantine once every sender passes.
Add a DMARC recordSpam words in your copy
Rewrite the highlighted phrases. Stacked urgency and money words cost more than one mild “free”.
Rewrite with the spam testerBlocklisted domain or IP
Stop sending to unengaged contacts, clean the list, then request delisting once authentication passes.
Recover from a blocklistNo one-click unsubscribe
Gmail and Yahoo require List-Unsubscribe and List-Unsubscribe-Post on bulk mail. Your sending tool has to add them.
Read the bulk sender rules
FAQ
Mail tester, answered
How is the score out of 10 calculated?
Every email starts at 10. Each problem removes points: a failed DMARC check removes 2, a missing DKIM signature 1, a broken link 0.3, and trigger words up to 6.5 depending on how many and how strong they are. One or two mild words like “free” cost nothing. The report shows what each section cost you.
Is my email stored?
The raw email is deleted as soon as it is analyzed. The report is kept for 24 hours, reachable only through its private link, then deleted. We only keep anonymous usage stats: the score and the sender's domain, never the content or the addresses.
Why should I send from my real setup?
Authentication depends on the server that sends the email. A forward or a copy-paste into another mailbox tests that mailbox, not your campaign. Send a test from the same tool, sender and domain you use for your list.
My score is 10/10. Will I land in the inbox?
Your setup and content are right. Inbox placement also depends on your sending reputation and how readers engage: send to people who asked for your emails and remove those who never open.
Is this an alternative to mail-tester.com?
Yes. It works the same way: one address, one real email, a score out of 10. It is free, needs no account, and also checks Gmail’s 102 KB clipping, one-click unsubscribe headers and every linked domain against Spamhaus.
Does the mail tester show whether I land in Gmail’s inbox or Promotions?
No. Tabs and spam placement depend on your reputation with each provider and on how your readers engage, which no test address can see. The score tells you whether anything in your setup or content gives a filter a reason to block you.
How many tests can I run?
Each address accepts three emails, so you can fix and resend. You can create up to 10 addresses per hour, free and without an account.
Import your list. Send tonight.
3,000 emails a month on the free plan, no card.