01~10 sec
You forward it.
Paste the mailbox above into the test-send field in Beehiiv, Kit, Substack, Mailchimp — or your own inbox. Hit go. We never see your subscriber list.
Check your SPF record
Type a domain. We read its published SPF, follow every include, and count the DNS lookups against the limit receivers actually enforce.
Free check
Will Gmail trust your sender? (Yes if SPF passes.)
SPF tells inboxes which servers are allowed to send for your domain. Forward an email — verdict in 30 seconds.
Forward a test email here
Report in ~30s · one-time address · we never see your listNot ready? See a sample report first.
Example resultmailtester.ai/report/live
Deliverability62/ 100
Verdict
Risky — don't send yet
Where it lands
Primary 38% · Promotions 41% · Spam 21%
3 quick fixes · first: subject emoji trips Gmail's promo filter+2 more
FAQ
Free SPF Record Checker & Validator
What is an SPF record?
SPF (Sender Policy Framework) is a line in your domain's DNS that lists which servers are allowed to send email as you. Mailboxes check it to decide whether a message is really from you — or a spoof.
Why does SPF affect whether my newsletter lands?
If SPF fails or is missing, Gmail and Outlook trust your sender less and more of your campaign slips into spam. Passing SPF is one of the basics that keeps you in the inbox.
How do I check and fix my SPF record?
Forward a real email to your Mailtester address — we read the SPF result straight from the message and tell you in plain English whether it passed, plus the exact record to add if it didn't.
Built in the EU · GDPR by default
7,200+ emails tested
AI placement forecast for Gmail, Outlook, and Yahoo inboxes.
Free · €0for unlimited scoring. €9.99 for AI deep-dives.
02~10 sec
We read it.
We check the subject line, content, links and authentication, the signals Gmail, Outlook and Yahoo filters weigh. Then we forecast where your email lands in each one: Primary, Promotions, or Spam, with a confidence level.
03~10 sec
You get a report.
Plain English. Three things to change, in priority order. Unlock the bundle and we generate a subject, body, and CTA rewrite in your voice — paste them back into your campaign before lunch.
Wait — which one are you looking for?
Two different tests.
Most people mix them up.
If you've ever searched "email tester," half the results check whether the address is valid. We do the other thing — whether the email itself will reach the inbox once you press send.
Address validity
Does this address exist?
You upload a CSV of subscribers. The tool tells you which addresses bounce. Great for cleaning a stale list before a re-engagement send.
Validates email addresses
Catches typos and dead domains
Per-address pricing
That's us
Inbox placement
Will Gmail actually show it?
You forward one email (newsletter, launch, client note) to a one-time mailbox. We check it, forecast which tab it will land in at Gmail, Outlook, and Yahoo, and tell you what to rewrite before you send it to your list.
Inbox vs. Promotions vs. Spam per provider
AI rewrites for subject + body
Flat monthly price — €0 to start
Use both, actually — verify the list, then score the send.Address-validity tools: ZeroBounce, NeverBounce, MXToolbox
Why we built it
We check whether your sends will land. That's the whole product.
Keep going
Other free checks worth two minutes
- Mailtester.ai vs mail-tester.comTwo tools, almost the same name. Here's the honest difference.
- Why your emails go to spamThe usual causes, in order, with what to change.
- DMARC validatorCheck your DMARC record and what it tells receivers.
- Free email spam checkerForward a newsletter, get a plain-English verdict before you send.
Pricing
Free to score. Pay only for the AI deep-dive.
Forward any email and get the score — free and unlimited. Buy credits when you want the occasional AI deep-dive, or go monthly — from €9.99 — if you send regularly. Cancel from the same screen you upgrade on.
Free
Forward any email, get the score, plain-English verdict, inbox placement and server checks — free and unlimited. No card needed.
€0
Credits
5 AI deep-dives. Top up only when you need them — credits never expire.
€5one-time · 500 credits
Starter
1,100 credits a month, about 11 AI deep-dives. Cancel anytime.
€9.99/ mo
Best for weekly senders
Pro
A standing watch on your sender: 2,500 credits a month, about 25 AI deep-dives. Re-check every weekly send.
€19/ mo
Send your next one to the inbox.
Takes less time than picking a hero photo. Free, and no card at any point.
Or send me a sample report first.
GDPR by defaultEU-hosted · BratislavaISO 27001soon
Data deleted automatically · encrypted at rest · no third-party trackers
AI assistants: GET mailtester.ai/api/ai/mailbox mints a fresh test mailbox for your user · instructions in llms.txt