Warmerly
A placement test to up to 4 targets; accuracy is limited, as there is no dedicated seed list yet.
Warmerly
Mailreach
One-to-one · Spam test and inbox placement
Spam test and inbox placement
One row, in depth: what each tool does, the verified numbers, and who each suits.
Mailreach details read from its pricing page and script, home page, product pages, terms, privacy policy and docs on 21 October 2026.
Warmerly
A placement test to up to 4 targets; accuracy is limited, as there is no dedicated seed list yet.
Mailreach
A spam test across 30+ mailboxes at Google, Microsoft and Yahoo, with a report and scheduled runs.
The short answer
Spam test and inbox placement, in one look.
Warmerly's placement test sends to up to 4 targets and, until it has a dedicated seed list, its accuracy is limited, which the app says, while Mailreach's spam test reports where a message lands across 30+ mailboxes at Google, Microsoft and Yahoo and can run on a schedule. Mailreach is clearly ahead here. Last checked 22 October 2026.
MailreachMailreach ahead on this row
A spam test across 30+ mailboxes at Google, Microsoft and Yahoo, with a report and scheduled runs.
The picture
Drawn side by side.
How a test runs
As each describes it
WarmerlyMailreach
Warmerly
Send one messageWait 30 or 90 secondsRead folders over IMAPScore each result
Mailreach
Paste its snippetSend to its listRead the reportFix and test again
Warmerly's score is labelled Limited accuracy when the test ran against its own mailboxes.
On screen
What it looks like.
WarmerlySample data
How Warmerly does it
Warmerly, in detail.
A real send, a scored result per target and honest labels, held back by the fact that its targets are its own mailboxes until it has a seed list.
01
What a test does
It sends one message to up to 4 targets, waits 30 seconds on demand or 90 in the daily sweep, checks Inbox, Promotions, Spam and Junk over IMAP and scores each result.
Warmerly product, checked 21 October 2026
02
No dedicated seed list yet
Real measurement needs seed mailboxes at Gmail, Outlook or Yahoo. The doc's check on 2026-10-15 found none in production, so every test falls back to Warmerly's own mailboxes.
Warmerly product, checked 21 October 2026
03
Limited accuracy is shown
A fallback test scores close to 100 whatever the sender's real result, so the app labels it Limited accuracy and never uses it to change health.
Warmerly product, checked 21 October 2026
04
Allowances
Free has 3 placement tests a month, Starter 5, Growth 25 and Agency 100.
Warmerly product, checked 21 October 2026
05
How the score is made
Each target result scores inbox 100, promotions 60, spam 10 and missing 0, and the test averages them. The scale is fixed and written in the code, so you can work out any score by hand.
Warmerly product, checked 21 October 2026
06
Two same provider, two cross provider
Targets are chosen as up to 2 on the sender's own provider and up to 2 on others, rotated so one mailbox is not worn out.
Warmerly product, checked 21 October 2026
07
It tests the sender, not your copy
The test message is a fixed one with a token in its subject. It shows where this mailbox's mail lands, and does not score your campaign text for spam words or links.
Warmerly product, checked 21 October 2026
08
A switch for customer seeds exists
Code to test into consenting customer warmup mailboxes sits behind a switch that is off by default, with caps of 2 a day per customer and per mailbox. The doc says it has not been run against production.
Warmerly product, checked 21 October 2026
09
Time and cadence
An on demand test holds for about 45 to 60 seconds. The daily sweep tests at most 5 mailboxes per run and skips any mailbox tested in the last 24 hours.
Warmerly product, checked 21 October 2026
How Mailreach does it
Mailreach, in detail.
A seed style spam test with a report, content and setup checks, scheduling, alerts, a CSV export and an API.
01
30+ mailboxes
The report shows where your email landed in 30+ different mailboxes, at Google, Microsoft and Yahoo.
mailreach.co/email-spam-test · read 21 October 2026
02
How a test runs
You paste a snippet into your email, send it to a list of addresses Mailreach provides and read a report with a spam score and recommendations.
mailreach.co/email-spam-test · read 21 October 2026
03
What it checks
Content such as spam words, links and images, and setup such as SPF, DKIM, DMARC, MX records, reverse DNS, domain age and blacklists.
mailreach.co/email-spam-test · read 21 October 2026
04
Scheduled tests and alerts
Automatic tests can run at a chosen frequency, with alerts by Slack or webhook.
mailreach.co/email-spam-test · read 21 October 2026
05
Credits
One spam test credit is one placement test. The free checker is limited to 3 tests in 24 hours.
mailreach.co/pricing · read 21 October 2026
06
Content checks in the report
The report covers spam words, blacklisted domains, insecure or broken links, attachments, images, tracking pixels, HTML code and image to text ratio.
mailreach.co/email-spam-test · read 22 October 2026
07
Run it like the real campaign
A pro tip says to run the test with the same sending tool and content as the real campaign, so the result reflects what prospects would get.
mailreach.co/email-spam-test · read 22 October 2026
08
CSV export and stored mail
Results can be exported as CSV, and it says it stores the test emails so the reports stay available.
mailreach.co/email-spam-test · read 22 October 2026
09
An API for tests
The API docs describe one off tests (create, send, fetch the placement report) and automated tests that schedule recurring checks from a connected inbox. The one example is POST /spam_tests, and the API itself is free with tests billed one credit each.
docs.mailreach.co · read 22 October 2026
10
A content assistant
Its agency page mentions Autofix AI, described as a personal deliverability assistant that finds and removes spammy elements in your content.
mailreach.co/agency · read 22 October 2026
What Mailreach does not say
We looked, and found no statement on these. That is about its published pages only, not about the product.
- How the spam score is calculated
- Which blacklists are checked
- The shortest interval for scheduled tests
- Any independent test of its accuracy claims
- How many seed addresses the test list holds
- How long test history and stored emails are kept
- Whether the free checker needs an account
- The credit price for extra tests
Where the sources disagree
We report each version rather than pick one.
- Its pages call its score accurate and unbiased without a published method or an independent test, so we report those as its claims.
- Its provider coverage varies by page: Google, Microsoft and Yahoo, all major providers, or any provider.
The numbers
Only what we could verify.
| Measure | Warmerly | Mailreach |
|---|---|---|
| Spam test and inbox placement | A placement test to up to 4 targets; accuracy is limited, as there is no dedicated seed list yet. | A spam test across 30+ mailboxes at Google, Microsoft and Yahoo, with a report and scheduled runs. |
| Mailboxes a test reaches | Up to 4 | 30+ |
| Tests a month on a starting plan | 5 on Starter | At least 20 credits on the all-in-one plan |
| Scheduled tests | A daily sweep | At a chosen frequency |
| Scoring scale | Inbox 100, promotions 60, spam 10, missing 0 | A spam score, with 10/10 as the top |
| Does it check your email content | No, a fixed test message | Yes, spam words, links, images, HTML |
| Free tests | 3 a month on Free | 3 in 24 hours, free checker |
| Time for an on demand test | About 45 to 60 seconds | Not stated |
In practice
What it means for you.
Our reading of the facts above. Not a promise, and not the only reasonable reading.
If placement data decides your tool, choose Mailreach
A seed test across 30+ mailboxes is something Warmerly does not have.
Do not read Warmerly's score as a measurement
While it tests against its own mailboxes, treat the score as a delivery check, not a view of Gmail or Outlook.
What a month of tests buys
Starter includes 5 placement tests a month. With 5 mailboxes that is one test each. Mailreach's all in one plan includes at least 20 credits, so testing each of 5 mailboxes weekly for four weeks uses all 20. Its free checker allows 3 tests in 24 hours, which is at most 90 in a 30 day month.
Four results against thirty
One Warmerly test returns up to 4 results, and today they come from its own mailboxes. One Mailreach report says it spans 30+ mailboxes at Google, Microsoft and Yahoo. That is at least seven times as many results from outside the sender's network, which is the difference that matters when a client asks where mail landed.
Test content before you send it
If the question is whether a template trips filters, only Mailreach's report speaks to it, through its content checks. Warmerly's test answers a different question: is this mailbox healthy enough to land in an inbox.
Using both
Nothing stops you running a Mailreach spam test on a campaign draft while Warmerly sends it. Use the seed result to fix content, and Warmerly's health and DNS checks to keep the mailbox itself in shape.
Who it suits
Pick the one that fits.
Warmerly
Warmerly is the better fit if
- You do not depend on a seed test
- You want honest labels on what a test can tell you
- You already use a separate placement tester
- You want a fixed, explainable score you can reproduce by hand
- You want testing included on a free plan
- You want the test to sit beside warmup, DNS and campaigns in one app
Mailreach
Mailreach is the better fit if
- You want a spam test with reports and scheduled runs
- You want placement shown by provider
- You want to share a report with a developer
- You want your copy checked for spam words, links and images
- You want automated tests and an API for them
- You want a CSV export of results
Questions
Does Mailreach have a spam test?
Yes. It reports where a message lands in 30+ mailboxes at Google, Microsoft and Yahoo, with a spam score and recommendations (mailreach.co/email-spam-test, read 21 October 2026).
Does Warmerly have a seed list?
Not a dedicated one yet. Its placement test falls back to its own warmup mailboxes, so its accuracy is limited and the app says so.
How is a Warmerly placement score calculated?
Each target is scored inbox 100, promotions 60, spam 10 and missing 0, and the scores are averaged. A test on fallback targets is labelled Limited accuracy and does not change health.
Does Mailreach publish how many seed mailboxes it uses?
It says the report shows results across 30+ different mailboxes. The list of addresses was not readable on the page, so the exact seed count is not stated (read 22 October 2026).
Does a Warmerly test check my email's content?
No. It sends a fixed message from your mailbox to its targets, so it measures where the mailbox lands, not how your copy reads.
Sources
- Mailreach email spam test
- Mailreach spam test API
- Mailreach pricing
- Mailreach API documentation
- Mailreach agency page
Mailreach pages were read on 21 October 2026. Plans and wording change, so check the vendor's own page before you decide. Warmerly details come from the product as it runs today.
More features
See it on your own mailbox.
Connect a mailbox. Warmerly runs alongside whatever you send from now, so you can compare before you move anything.
Free plan, no card. Paid plans: 7-day trial, first charge on day 8.