Warmerly
A placement test of up to 4 targets; accuracy is limited, as there is no dedicated seed list yet.
Warmerly
Warmbox
One-to-one · Spam rate and placement testing
Spam rate and placement testing
One row, in depth: what each tool does, the verified numbers, and who each suits.
Warmbox details read from its pricing, home, features, agency and checker pages and its help centre on 21 October 2026.
Warmerly
A placement test of up to 4 targets; accuracy is limited, as there is no dedicated seed list yet.
Warmbox
A spam rate for warm-up mail in analytics; an inbox placement test is listed as Coming Soon.
The short answer
Spam rate and placement testing, in one look.
Warmerly runs a placement test of up to 4 targets, but with no dedicated Gmail or Outlook seed list yet its accuracy is labelled limited. Warmbox shows a spam rate: the share of your warm-up emails that land in spam. Its checker page lists an inbox spam placement test as Coming Soon. Last checked 22 October 2026.
Warmbox
A spam rate for warm-up mail in analytics; an inbox placement test is listed as Coming Soon.
The picture
Drawn side by side.
How each one measures
The steps each page describes
WarmerlyWarmbox
Warmerly
Send one messageUp to 4 targetsWait 30 or 90 secondsScore inbox, promotions, spam
Warmbox
Warm-up mail sentNetwork inboxes act on itSpam rate countedShown in analytics
Warmerly's score is labelled Limited accuracy while tests run against its own mailboxes. Warmbox's spam rate counts warm-up mail, not your campaigns.
What each page calls it
As stated
WarmerlyWarmbox
A placement test
- Up to 4 targets a test
- Limited accuracy for now
- 5 tests a month on Starter
Spam rate and spam score
- Spam rate: share of warm-up mail in spam
- Spam score monitoring listed
- Inbox spam placement: Coming Soon
Read on warmbox.ai and help.warmbox.ai, 21 October 2026.
On screen
What it looks like.
WarmerlySample data
How Warmerly does it
Warmerly, in detail.
A placement test, labelled Limited accuracy for now.
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. A check on 15 October 2026 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
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
06
How the score is built
Each target result scores 100 for inbox, 60 for promotions, 10 for spam and 0 if the message is missing, and the test score is the average across targets.
Warmerly product, checked 21 October 2026
07
Which targets
A test picks up to 2 targets on the same provider as the sender and up to 2 on other providers, so a Gmail mailbox is checked against both Gmail and non-Gmail recipients.
Warmerly product, checked 21 October 2026
08
Three sources of targets
The best is a dedicated seed mailbox at Gmail, Outlook or Yahoo, then consenting mailboxes of other customers in the warmup network, then Warmerly's own pool mailboxes as a degraded fallback.
Warmerly product, checked 21 October 2026
09
A degraded run never changes health
A run against our own pool mailboxes scores close to 100 whatever the sender's real standing, so it is labelled Limited accuracy and kept out of health, spam score and the ramp.
Warmerly product, checked 21 October 2026
10
Trends compare like with like
A change between two tests is shown only when both ran against the same kind of target.
Warmerly product, checked 21 October 2026
11
A daily sweep
A daily job tests up to 5 mailboxes per run and skips any mailbox tested in the last 24 hours. A test left running for over 20 minutes is marked failed.
Warmerly product, checked 21 October 2026
12
On demand from the Health tab
A test started from a mailbox's Health tab takes about 45 to 60 seconds with four targets and is stored even if you close the browser.
Warmerly product, checked 21 October 2026
How Warmbox does it
Warmbox, in detail.
A spam rate for warm-up mail, and a placement test not yet released.
01
Spam rate
The Analytics article describes "Spam Rate" as the proportion of warm-up emails sent from your inbox that end up in spam.
help.warmbox.ai/en/articles/4803475-analytics · read 21 October 2026
02
Spam score monitoring
"Spam score monitoring" is listed in the features included in all plans, and the dashboard is said to show emails sent, replies rate, spam score and schedule.
warmbox.ai/the-best-email-warm-up-solution-discover-our-features · read 21 October 2026
03
Placement test: coming soon
The checker page lists inbox spam placement as "Coming Soon".
warmbox.ai/ips-domains-blacklist-dns-settings-deliverability-checker · read 21 October 2026
04
No seed list found
We found no seed list or placement-test product on the pages we read.
warmbox.ai · read 21 October 2026
05
The Email Spam Checker
The help centre describes an Email Spam Checker menu with a Run a new test button. You send an email to a given address and wait up to 2 minutes for the result.
help.warmbox.ai/en/articles/5239456-run-an-email-deliverability-check · read 22 October 2026
06
A score out of 100
The report gives a Deliverability Score from more than 120 items. Below 30 is considered spam and above 80 good.
help.warmbox.ai/en/articles/5239460-get-my-email-deliverability-report · read 22 October 2026
07
It tests the email you send
The check analyses the test email you send to Warmbox, with items such as SpamAssassin score, blacklists and authentication. It does not say it reads where the email lands at Gmail or Outlook.
help.warmbox.ai/en/articles/5239459-send-a-test-email · read 22 October 2026
08
Spam rate on warm-up mail
The analytics view shows a Spam Rate, the proportion of warm-up emails from your inbox that end up in spam, as an indicator to follow.
help.warmbox.ai/en/articles/4803475-analytics · read 22 October 2026
09
Interactions counted
Analytics also counts interactions such as responses, openings, removal from spam and starring by the network inboxes.
help.warmbox.ai/en/articles/4803475-analytics · read 22 October 2026
10
Reports kept and shared
Reports can be kept in a dashboard, shared by public link and deleted.
help.warmbox.ai/en/collections/2725629-check-my-email-deliverability · read 22 October 2026
11
Network says it rescues from all major providers
The network article says your emails land in and are rescued from all major providers such as Google and Outlook and many private domains.
help.warmbox.ai/en/articles/4803429-the-warmbox-inbox-network · read 22 October 2026
What Warmbox does not say
We looked, and found no statement on these. That is about its published pages only, not about the product.
- A seed list or inbox placement test that is live
- How the spam score is calculated
- Which mailbox providers a spam check looks at
- How many seed inboxes a check uses
- Whether the score changes warm-up settings
Where the sources disagree
We report each version rather than pick one.
- The checker page lists Inbox Spam Check as Coming Soon for the major providers, but the help centre documents an in-app Email Spam Checker with a score out of 100. The help pages may describe a different test, a content and DNS test of one email, and neither page says so.
- The features page says the audit is based on more than 120 checkpoints, while the checker page says 100+ blacklists. The counts may measure different things.
The numbers
Only what we could verify.
| Measure | Warmerly | Warmbox |
|---|---|---|
| Spam rate and placement testing | A placement test of up to 4 targets; accuracy is limited, as there is no dedicated seed list yet. | A spam rate for warm-up mail in analytics; an inbox placement test is listed as Coming Soon. |
| Targets in one placement test | Up to 4 | Not stated |
| Tests in a month on the first paid plan | 5 (Starter) | Not stated |
| Spam rate shown for warm-up mail | Not shown | Yes, in analytics |
| Score range | 0 to 100 per test, from 100 for inbox to 0 for missing | 0 to 100, from more than 120 items |
| Time for a test | About 45 to 60 seconds on demand | Up to 2 minutes |
| Providers in a test | Same provider and other providers, up to 2 each | Not stated |
| Folders checked | Inbox, Promotions, Spam and Junk | Not stated |
| Tests in a month on Free | 3 | Not stated |
| Tests in a month on Agency | 100 | Not stated |
| Meaning of a low score | Spam scores 10 per target | Below 30 is considered spam |
| Shareable report | Not stated | Public link |
In practice
What it means for you.
Our reading of the facts above. Not a promise, and not the only reasonable reading.
Neither is a true inbox placement result
Warmerly's test is limited until it has real seed mailboxes. Warmbox's spam rate measures its own warm-up mail, not your campaigns.
Treat both as signals
Check placement yourself by sending to your own Gmail and Outlook inboxes.
Know what each number measures
Warmerly's test sends a real message and looks in folders. Warmbox's spam rate counts warm-up mail, and its spam checker scores the email you send it. They measure different things.
Look for the Limited accuracy label
A Warmerly result against its own pool is marked Limited accuracy. Treat that as a signal, not a placement result.
Test the email you actually send
Warmbox's checker reads one email you send. If your campaign copy differs, send that copy.
Do not trust a single run
Both tools sample a small set. Repeat over several days and watch the trend.
Check by hand too
Send to your own Gmail and Outlook accounts and look in the folders. It costs nothing and shows what a customer sees.
Warm-up mail is not campaign mail
A spam rate on warm-up emails says how the network treats that traffic, not how prospects' filters treat yours.
Who it suits
Pick the one that fits.
Warmerly
Warmerly is the better fit if
- You want a placement test you can run on demand
- You want a test that opens real folders and scores inbox, promotions and spam
- You want the allowance in the plan, from 3 to 100 a month
- You want a result labelled when its accuracy is limited
- You want a daily sweep of your mailboxes
- You want trends only compared like with like
- You want test results kept out of your ramp when they are degraded
Warmbox
Warmbox is the better fit if
- You want a spam rate for warm-up mail shown in your dashboard
- You want a spam rate on your warm-up mail in the same dashboard
- You want one score out of 100 with a guide for each item
- You want to share a report by public link
- You want the SpamAssassin score and authentication in one report
- You are happy to send a test email by hand
- You want a deliverability library to read alongside
Questions
Does Warmbox test inbox placement?
Its checker page lists an inbox spam placement test as Coming Soon. It does show a spam rate in analytics.
How many placement tests does Warmerly include?
3 a month on Free, 5 on Starter and 100 on Agency, with up to 4 targets per test.
How long does a test take?
About 45 to 60 seconds on Warmerly. Warmbox's checker takes up to 2 minutes.
What does a low score mean?
On Warmerly each spam target scores 10 on a 0 to 100 scale. On Warmbox below 30 is considered spam.
Is Warmerly's placement test fully accurate?
Its accuracy is labelled limited, since there is no dedicated Gmail or Outlook seed list yet.
Sources
- Warmbox help: analytics
- Warmbox deliverability checker
- Warmbox features
- Warmbox help: run a deliverability check
- Warmbox help: get my report
- Warmbox help: check my deliverability
Warmbox 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.
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