Mailtester.ai vs mail-tester.com: which mail tester?
Mailtester.ai vs mail-tester.com: which one do you actually need?
Two tools, almost the same name — and they don't do the same thing. mail-tester.com gives you a spam score out of 10. Mailtester.ai predicts where your newsletter will land — Primary, Promotions or Spam — and turns that into a plain-English verdict. Here's which one fits what you're doing.
Are Mailtester.ai and mail-tester.com the same thing?
No — the near-identical names cause confusion. Both names are real: they're two different tools from two different companies, and both are email deliverability checkers. You send or forward a newsletter to a generated address and get back a read on whether it'll reach the inbox. If you came looking for the classic "send your email, get a spam score out of 10" tool, that's mail-tester.com — a fast, free, well-known check, and a good one. Mailtester.ai does something adjacent but different: it predicts where your newsletter will land in Gmail, Outlook, and Yahoo and turns that prediction into a plain-English verdict — Safe to send, Risky, or Don't send — plus three fixes.
Mailtester.ai vs mail-tester.com, line by line
Both tools start the same way — you send an email to a generated address. What they hand back is where they part ways. Here it is, one row at a time:
| What each one actually does | mail-tester.com | Mailtester.ai |
|---|---|---|
| How it works | Sends your email to one generated address, shows you a spam score for that one message. | Forwards your email to a generated address, reports where that message actually landed across several real inboxes. |
| What you get back | Returns a single spam score out of 10, from a vanilla SpamAssassin install run against one mailbox. | Returns an inbox-placement forecast — the predicted share of your send that reaches Primary, Promotions or Spam in Gmail, Outlook, and Yahoo. |
| The answer | Leaves you to interpret what the score means. | Turns the same signals into a plain-English verdict: Safe to send, Risky, or Don't send. |
| The fixes | Lists what's configured correctly and what isn't, written for someone comfortable with email infrastructure. | Gives you three fixes in plain English and writes AI rewrites for the content ones. |
| Authentication (SPF, DKIM, DMARC) | Puts SPF, DKIM and DMARC front and centre — it is the whole Free Tools menu of authentication checkers. | Checks the same SPF, DKIM and DMARC, then folds the detail behind a toggle marked "marketers can skip this." |
| Who it's built for | Built for the technical sender wanting a fast, free spam score and the DNS tools to chase a clean 10. | Built for the marketer sending a newsletter in Mailchimp, Substack, or Beehiiv, and wants to know whether it'll land. |
What a spam score out of 10 actually measures
A spam score out of 10 is a SpamAssassin score. SpamAssassin is an open-source filter that runs your message against a long list of rules. Ten out of ten means it tripped none of them, which tells you your email is built correctly.
What a spam score catches
- SPF, DKIM and DMARC records that are missing, broken, or don't line up with the domain.
- A sending IP or domain sitting on a public blacklist.
- Construction problems in the message itself.
- Wording and formatting that spam filters have learned to mark down.
What a spam score can't tell you
- Which folder Gmail will choose.
- How your own list behaves (opens, deletes, and "report spam" clicks).
- Whether you landed in Promotions.
Mailtester.ai runs SpamAssassin too, on the same open-source rules, and shows you the same rule names. The difference is that Mailtester.ai provides a plain-English verdict instead of a score and three fixes written out.
"I scored 10/10 and I'm still in spam" — why that happens
A perfect score doesn't guarantee the inbox, as all spam filters work differently. A spam score checks against one filter on one mailbox and can't see that Gmail sorted you into Promotions.
Looking for a mail-tester.com alternative?
Why people go looking
- Ran out of free checks.
- Scored well and still landed in spam.
- Wanted fixes written out instead of rules.
What's actually out there
Another spam-score checker
unspam.email and MailGenius work like mail-tester.com, giving a score and rules you tripped.
A seed-list placement service
GlockApps has you send a campaign to their panel of mailboxes and report which folder each one filed it into.
An email verifier
ZeroBounce and NeverBounce check if addresses on your list still exist.
So which one do you want?
Pick mail-tester.com when
- You want a fast, free spam score with no account.
- Comfortable reading SPF, DKIM and DMARC.
- Doing a technical, one-message check.
Pick Mailtester.ai when
- Want to see where your newsletter lands across Gmail, Outlook, and Yahoo.
- Prefer a plain-English verdict with fixes.
- Send from Mailchimp, Substack, or Beehiiv.
Forward one newsletter and see the difference
The fastest way to see which tool you want is to run yours. Forward a newsletter and get your score, the SpamAssassin result, a plain-English verdict, and the SPF, DKIM and DMARC results.
FAQ
Are Mailtester.ai and mail-tester.com the same company?
No, they are two different tools from different companies.
Why does a 10/10 on mail-tester.com still go to spam?
Because it checks your message against one filter; Gmail may still file you under Promotions or Outlook may hold back a new sender.
Does Mailtester.ai check whether email addresses are valid?
No, that's a verifier's job. Both tools check whether your sends land in the inbox.