Mail-Tester vs Warmy (2026): which should you pick?
As of Nov 12, 2026, Mail-Tester grades higher than Warmy: 2.8 against 2.4 out of 4.0.
Checked Oct 18, 2026 and Nov 12, 2026 · graded Oct 18, 2026 and Nov 12, 2026 by ToolGPA
Mail-Tester grades higher on value for money, the free plan and ease of use. Warmy grades higher on features. They get the same grade on platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Mail-Tester
Send an email to a test address and get a spam score out of 10
Warmy
Email warm-up with seed testing, verification and DMARC monitoring
Which one is for you
Pick Mail-Tester if
- Fits if you want to check one newsletter or template before sending
- Works for developers who want the score inside their own tool
Look elsewhere if
- Tight if you test more than 3 times a day on free, with results kept for 7 days
- Skip it if you want ongoing monitoring, since it tests one message at a time
- Watch out: the score comes from SpamAssassin and other spam filters differ
- Watch out: prices exclude VAT
Pick Warmy if
- Fits if you want warm-up, list checks and DMARC watched on one bill
- Works for senders on Klaviyo, Shopify or Mailchimp
Look elsewhere if
- Not for you if you want a firm price before a sales call, as only the $49 start is listed
- Pricey if you're warming a single inbox, at $49 against $15 to $20 elsewhere
- Tight if a team shares it, as members draw on one plan's mailbox quota
- Watch out: no yearly discount or plan tiers are listed, and larger needs go through a demo
How we grade them
| 2.8GPAMail-TesterGood | 2.4GPAWarmyFair | |
|---|---|---|
| Value for money | BSubscriptions start at $10 a month for 50 tests, level with the $10 cheaper quarter of deliverability tools. A 10-test pack is $5, and prices exclude VAT. | CFrom $49 a month, priced by warm-up volume rather than per inbox, with no yearly discount listed. Among its listed warm-up rivals that's above Warmup Inbox ($15) and MailReach ($20) for one inbox but under InboxAlly ($149), and list checks and DMARC monitoring come with it. |
| Free plan and trial | B3 tests in any 24 hours with no account, results kept for 7 days. One person checking now and then can live on that. | CNo free plan, but a 7-day trial of any package with no card, and every feature is open during it. |
| Features | CA spam score, a configuration report and a JSON API. It uses a stock SpamAssassin setup, so a perfect score does not guarantee inbox placement, and it does one message at a time. It does that job fully, and it is a smaller job. | BIt covers all three jobs on every plan: warm-up with business or consumer inboxes, a rotating US seed list, list checks and DMARC monitoring, plus placement tests, Postmaster data and an AI co-pilot that suggests fixes. |
| Ease of use | BNo store rating on record. You send a mail to a displayed address and read the result, so there is nothing to set up. | CNo App Store rating on record. There's a lot to take in, from warm-up volume to DNS records and seed tests. The AI co-pilot reads your data and suggests what to fix. |
| Platforms and integrations | BWeb only, with a JSON API, an iframe and white-labeling. No desktop or phone app. | BWeb and a Chrome extension, with Klaviyo, Shopify, Mailchimp, HubSpot, SendGrid, Amazon SES and Google Postmaster Tools, a documented API, and Zapier, n8n and Make. No phone or desktop app. |
| Best for | checking one email's spam score | warm-up, list checks and DMARC in one plan |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Mail-Tester and Warmy. How we grade
Price against what you get
Mail-Tester starts at $10 a month and scores 2.7 out of 4 on features, ease of use and platforms. Warmy starts at $49 a month and scores 2.7.
They score the same, and Mail-Tester starts $39 a month lower. Of the other email verification and deliverability tools on the chart, none scores higher than Mail-Tester for less, and none scores higher than Warmy for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- Mail-Tester also covers reports.
- Warmy also covers email verification, inbox warm-up and dMARC.
At a glance
| Mail-Tester | Warmy | |
|---|---|---|
| Pricing | Free plan | Free trial |
| Starts at | $10 per month for 50 tests; or $5 once for 10 tests | $49 per month and up |
| Free plan | Free web interface: 3 tests per 24 hours, results kept for 7 days. | None |
| Free trial | None listed | 7-day free trial of any package, no credit card required |
| Web | ||
| Browser extension | ||
| Made by | Mail Tester LLC | Warmy.io |
| Price read from | mail-tester.com | warmy.io |
| Checked | Nov 12, 2026 | Oct 18, 2026 |
Worth knowing
Mail-Tester
- Scores come from a stock SpamAssassin setup; the FAQ says other spam filters differ, so a perfect score does not guarantee inbox placement.
- The free version allows 3 tests in 24 hours and keeps results for 7 days; an account with your own prefix keeps them 30 days.
- Prices exclude VAT.
- It tests one message at a time and does not monitor sending over time.
Warmy
- The pricing page gives only a starting price of $49 a month; the real cost depends on warm-up volume.
- Plans are priced by warm-up volume, not per inbox, and team members share the plan's mailbox quota.
- The vendor lists no annual discount or plan tiers on the page; larger needs go through a demo.
Key features
Mail-Tester
- Spam score
- Scores a sent message out of 10 using a default SpamAssassin install, with the sign reversed so that a higher score is better.
- Configuration report
- Reviews the message, the mail server and the sending IP, and lists what is set up correctly and what is not.
- JSON API and iframe
- Paid plans let you embed mail-tester results in your own software.
- White-labeling and custom CSS
- Accounts can restyle the result page and fully white-label it, after contacting the company to authorize their domain.
- Usage statistics and history
- Daily, weekly and monthly usage statistics and a list of the last 30 days of tests, with no ads on results.
Warmy
- Warm-up network
- Domains and IPs warm up with real business or consumer mailboxes, sending during working hours in the recipient's time zone.
- US seed list
- More than 500,000 US seed mailboxes, rotated monthly, open and reply to your sends and move them out of spam.
- Verification and DMARC tracker
- List verification and SPF, DKIM and DMARC monitoring are included on every plan, with the exact record to change.
- Adeline AI co-pilot
- Reads your tests, DNS and warm-up data and suggests what to fix; a template optimizer scores emails and rewrites parts that trigger spam filters.
- Reputation and Postmaster data
- Tracks domain and IP reputation with blacklist alerts, and pulls Google Postmaster data in beside warm-up results.
- API and automation
- A documented API covers every feature, with n8n, Zapier and Make for automation and a Chrome extension for checking templates.
Plans
Mail-Tester
Free web interface$0
3 tests in any 24 hours, no account needed, results available for 7 days.
10 Tests$5
one-time
A pack of 10 extra tests at $0.50 each. Larger one-time packs run up to 15,000 tests for $700.
50 Tests / Month$10
per month for 50 tests
Subscription with an account; $0.20 per test.
500 Tests / Month$25
per month for 500 tests
$0.05 per test.
2,000 Tests / Month$80
per month for 2,000 tests
Marked most popular on the page; $0.04 per test.
7,500 Tests / Month$250
per month for 7,500 tests
$0.0333 per test. A 25,000-plus tier is quoted on request.
Warmy
B2B sender$49
per month and up
Warm-up inside a network of Google Workspace and Microsoft 365 business mailboxes; the price follows the warm-up volume you need.
B2C sender$49
per month and up
Warm-up inside consumer mailboxes at Gmail, Yahoo and Outlook; the price follows the warm-up volume you need.
Custom planCustom
A plan designed with Warmy's team around your volume and providers, with a dedicated success manager.
Common questions
Which is cheaper, Mail-Tester or Warmy?
As of Nov 12, 2026, Mail-Tester is cheaper to start with: $10 a month, against $49 a month for Warmy. Mail-Tester starts at $10 per month for 50 tests; or $5 once for 10 tests, and Warmy starts at $49 per month and up.
Which has a free plan, Mail-Tester or Warmy?
As of Nov 12, 2026, only Mail-Tester has a free plan. Warmy does not, though it has a free trial.
Which platforms do Mail-Tester and Warmy run on?
As of Nov 12, 2026, only Warmy lists a browser extension. Both list a web app. A platform missing from a listing is one its maker's pages did not mention.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.