01
Authentication
Proves that the email really comes from your domain.
- SPF
- DKIM signature
- DMARC policy
- Domain alignment
- Free mailbox senders
Free email spam test
Check if your email lands in spam with our mail tester
Send your email to the address below. In about ten seconds you get a spam score out of 10 and a clear list of fixes for authentication, blocklists, content and links.
Send your email to this address
Creating your test address…Creating your test address…
Send it from your usual tool (your newsletter software, your sending service or your mailbox) so the test covers your real setup.
- 24checks per email
- 13blocklists queried
- ≈10 sto get your score
- Freeno sign-up needed
How the mail tester works
No account and no setup: you test the real email your subscribers will receive.
Setup
Get a test address
We create a unique address that accepts up to three emails for one hour.
Sending
Send your email
Send the campaign exactly as your subscribers will receive it, from your usual sending tool.
Analysis
Read your score
We verify the authentication, query the blocklists, open every link and review the content, then explain each fix.
What the mail tester checks
Receivers like Gmail, Outlook and Yahoo look at who sends, how the email is built and what it says. The mail tester checks the same signals.
02
Reputation
Checks whether your server or your links are known for spam.
- 10 IP blocklists, including Spamhaus
- Spamhaus DBL, SURBL and URIBL
- Reverse DNS
03
Gmail and Yahoo rules
The requirements for bulk senders in force since 2024.
- One-click unsubscribe header
- Visible unsubscribe link
- Message-ID and Date headers
04
Content
Spots the words and habits that filters associate with spam.
- Trigger words in English and French
- Subject line
- Capitals and exclamation marks
05
Formatting
Makes sure the message displays well in every inbox.
- Gmail clipping at 102 KB
- Text to image balance
- Image hosting and alt text
- Plain text version
06
Links
Opens every link the way a careful reader would.
- Broken links
- Link text that hides another domain
- Shorteners and raw IP addresses
- Scripts, forms and iframes
How the spam score works
Every email starts at 10. Each problem removes points, and each area has a ceiling, so one weak spot lowers the score without wiping it out.
What your score means
- 9 to 10
Ready for the inbox. Send it to your whole list.
- 7 to 8.9
Good, with room to improve. Fix the warnings before your next campaign.
- 5 to 6.9
Your email may land in spam. Part of your list will find it in spam.
- Under 5
Your email will likely land in spam. Fix authentication and content first.
Example
Three spammy phrases in the subject and one shortened link:
10−1.5 Content−0.5 Links= 8/10
Maximum points removed per area
Even when several checks fail, an area never removes more than its ceiling.
- Authentication−4 pts
- Reputation−5 pts
- Gmail and Yahoo rules−2.5 pts
- Content−2 pts
- Formatting−2.5 pts
- Links−2 pts
Why do emails land in spam?
Most emails land in spam for one of three reasons. The receiver cannot prove that you sent it, the sending server has a bad reputation, or the message looks like the spam it sees every day.
Authentication comes first. SPF lists the servers allowed to send for your domain, DKIM signs each email, and DMARC tells receivers what to do when both fail. Since 2024, Gmail and Yahoo reject bulk mail that lacks them.
Reputation follows. If your sending IP or a domain in your links appears on a blocklist such as Spamhaus, many receivers stop reading there. Shared sending services usually keep their IPs clean, which is one reason to use one.
Content and formatting decide the rest: a subject in capitals, an email made of one large image, a missing unsubscribe link or HTML heavy enough for Gmail to clip it. Each of these is easy to fix once you see it, which is what this mail tester is for.
You have a question?
We’ve got you covered.
See the list below for our most frequently asked questions.
Yes, and without an account.
Aim for 9 or more. Between 7 and 9 the email will usually reach the inbox, but fixing the warnings protects your next campaigns. Under 7, part of your list will likely find it in spam.
Send a real email when you can. Only a received email shows the DKIM signature, the IP of your sending server and the headers your tool adds. Pasting the HTML is a quick check of the content, links and domain records before you send.
Test addresses stop accepting emails after one hour, and each test and its email are deleted automatically after 24 hours. We only use the content to compute your report.
Yes. The same checks are available through a REST API: create a test address, poll its report, or analyze HTML before sending. See the API documentation.
Your sending service gives you the DNS records to add: one SPF record listing its servers, one or more DKIM keys, and a DMARC record. Add them at your domain registrar, wait for the DNS to update, then run a new test.
The MailerPress team publishes the mail tester as a free, non-commercial project: no paid plan, no advertising. It helps every sender reach the inbox, whatever tool they use.