Warmerly
16 blocklist registries checked, 6 for domains and 10 for IPs.
Warmerly
Mailivery
One-to-one · Blacklist monitoring
Blacklist monitoring
One row, in depth: what each tool does, the verified numbers, and who each suits.
Mailivery details read from its pricing page, home page, product pages and API page on 21 October 2026.
Warmerly
16 blocklist registries checked, 6 for domains and 10 for IPs.
Mailivery
70+ blacklists for domains and IPs, with alerts on the platform and by email.
The short answer
Blacklist monitoring, in one look.
Warmerly checks 16 named registries, 6 for domains and 10 for IPs, while Mailivery monitors 70+ blacklists, so Mailivery's number is larger. Mailivery monitors 70+ blacklists for domains and IPs, alerts you on the platform and by email, and says it tells you when you are off a list. Warmerly checks 16 named registries, 6 for domains and 10 for IPs, and never shows an unanswered check as green. Mailivery's number is larger, and its own pages give two figures for it. Last checked 22 October 2026.
MailiveryMailivery ahead on this row
70+ blacklists for domains and IPs, with alerts on the platform and by email.
The picture
Drawn side by side.
How a check runs
The steps each page describes
WarmerlyMailivery
Warmerly
DNS lookup per registryResult savedUnknown stays unknown
Mailivery
Add your domains and IPsChecked against 70+ listsAlerts by email and on the platformRecommendations to fix
Mailivery's pages do not name the lists or say how often they are checked. Its pricing table lists 2 blacklist monitors on Starter, 10 on Professional and 50 on Business.
How Warmerly does it
Warmerly, in detail.
Sixteen registries, named, queried by plain DNS, with refusals never read as listings and a partial answer shown as partial. The list is chosen, not maximised, and the reasons for what is left out are written down.
01
Domain registries
Six: Spamhaus DBL, SURBL, URIBL, NordSpam DBL, Spam Eating Monkey URI and s5h.
Warmerly product, checked 21 October 2026
02
IP registries
Ten: Spamhaus ZEN, SpamCop, Barracuda, PSBL, Mailspike, NordSpam, Spam Eating Monkey, Lashback UBL, DroneBL and GBUdb Truncate.
Warmerly product, checked 21 October 2026
03
Unknown is never green
If a registry cannot be queried the result is unknown, and it outranks a warning in the overall verdict.
Warmerly product, checked 21 October 2026
04
A free checker
The free blacklist checker tool on warmerly.com looks a domain up without an account.
Warmerly product, checked 21 October 2026
05
A refusal is not a listing
Several registries answer a refused query with an address inside the same range used for real listings. Each zone classifies its own codes, anything unrecognised is an error, and an error is never reported as listed.
Warmerly product, checked 21 October 2026
06
Coverage is stated
Clean on 13 lists and clean on the 3 that answered while 10 refused are different results. The check stores how many zones were queried and how many errored, and a partial answer shows amber with the count.
Warmerly product, checked 21 October 2026
07
Three left out on purpose
SORBS, which shut down in 2024, UCEPROTECT, which charges to delist, and Invaluement, which is subscription only, are excluded, and the reasons are in the code header.
Warmerly product, checked 21 October 2026
08
Policy lists are not alarms
Spamhaus PBL lists whole consumer ranges whether or not they ever sent mail. Those listings show in their own muted section and are never alerted.
Warmerly product, checked 21 October 2026
09
What the IP check measures
It resolves the mailbox's SMTP submission host. For a large provider that is not the sending pool, so provider hosts are skipped and the app says your mail server's IP, not your sending IP.
Warmerly product, checked 21 October 2026
10
Sweep and alerts
A sweep runs every 6 hours, a standing alert is withdrawn when a listing clears, and one alert goes to each owner per listed domain, not one per mailbox.
Warmerly product, checked 21 October 2026
11
The resolver is tested first
Before trusting a sweep it queries a Spamhaus address that is always listed and requires the listed answer, so a broken resolver cannot report every customer clean or listed.
Warmerly product, checked 21 October 2026
How Mailivery does it
Mailivery, in detail.
A named product on its own page, with a plan limit on monitors, alerts on the platform and by email, and a delisting follow-up. It is a bigger count with less written about method.
01
70+ blacklists
The monitoring page says We actively monitor 70+ blacklists and checks domains and IPs.
mailivery.io/blacklist-monitoring · read 21 October 2026
02
Alerts
You are told on the platform and in email reports, and when you are off a blacklist.
mailivery.io/blacklist-monitoring · read 21 October 2026
03
Recommendations
It gives actionable recommendations to resolve a listing. The page does not say it submits delisting for you.
mailivery.io/blacklist-monitoring · read 21 October 2026
04
Monitors by plan
The pricing table lists 2 blacklist monitors on Starter, 10 on Professional and 50 on Business.
mailivery.io/pricing · read 21 October 2026
05
Four steps stated
You add domains and IPs, it checks them regularly, you are alerted on the platform and by email report when one is listed, and you follow its recommendations. It says it will inform you when you are off a list.
mailivery.io/blacklist-monitoring · read 22 October 2026
06
The reason it gives
The page says blacklists can cut open rates by up to 50 per cent. It is a claim without a source on the page.
mailivery.io/blacklist-monitoring · read 22 October 2026
07
Part of the placement report
The placement test also checks the domain and IP against 70+ known blacklists in real time and says which list, how severe, and the delisting steps.
mailivery.io/inbox-placement-test · read 22 October 2026
08
Part of the health score
The comparison page lists blacklist monitoring as an input to the mailbox health score, beside DNS setup and domain age.
mailivery.io/competitor-comparison · read 22 October 2026
09
On every plan
The blacklist page says it is included in all plans, and the warm-up page repeats 70+ blacklist monitoring as a feature of every plan.
mailivery.io/email-warm-up · read 22 October 2026
10
Monitors rise with the plan
Starter lists 2 monitors, Professional 10 and Business 50, which is the only place a limit appears.
mailivery.io/pricing · read 22 October 2026
What Mailivery does not say
We looked, and found no statement on these. That is about its published pages only, not about the product.
- The names of the blacklists
- How often they are checked and how fast an alert arrives
- Whether the monitor count means domains or IPs
- Which of its monitors count a domain and which count an IP
- The delay between a listing and the alert
- Whether it submits delisting requests for you
Where the sources disagree
We report each version rather than pick one.
- Count: its blacklist and home pages say 70+ blacklists, while its comparison page says across 100+ blacklists.
The numbers
Only what we could verify.
| Measure | Warmerly | Mailivery |
|---|---|---|
| Blacklist monitoring | 16 blocklist registries checked, 6 for domains and 10 for IPs. | 70+ blacklists for domains and IPs, with alerts on the platform and by email. |
| Blacklists checked | 16 registries | 70+ |
| Domains and IPs | Both | Both |
| Monitors on a starting plan | Not a plan limit | 2 on Starter |
| Alert channel | Alert to the owner, per listed domain | On the platform and email reports |
| Check frequency | Every 6 hours | Regularly, not specified |
| Partial answers | Shown amber with the count | Not stated |
| Monitors on Business | Not a plan limit | 50 |
| Monitors on Professional | Not a plan limit | 10 |
In practice
What it means for you.
Our reading of the facts above. Not a promise, and not the only reasonable reading.
More lists is not always better
A bigger count covers more small lists, and some are rarely used by mailbox providers. The big ones, such as Spamhaus, are in both.
Check what you will act on
The useful part is the alert and the fix, not the count.
Reading 70 against 16
70 is 54 more than 16, but the 16 are named and tested against refusals, and Mailivery names none of its 70. A count only helps when you can tell which lists matter to your mail, so ask for the list before you use the number to choose.
How many monitors you need
At Mailivery a single domain and one sending IP take 2 monitors if each counts as one. That is the whole of Starter. A team with 8 domains needs 8 or 16 depending on how its monitors are counted, which is why the unanswered question matters. Professional's 10 covers 8 domains if only domains count and not if IPs do too.
Time to notice a listing
A sweep every 6 hours means a listing is noticed within 6 hours of a check, at worst. Mailivery says alerts are instant on its blacklist page. Its warm-up page and placement page do not give a check frequency, so we cannot compare the two.
What to do on an alert
In both tools the fix is outside the tool: you ask the registry to delist, after you fix the cause. Mailivery says it gives steps and Warmerly's finding names the list.
Who it suits
Pick the one that fits.
Warmerly
Warmerly is the better fit if
- You want the registries named and the unknown state honest
- You want blocklist checks inside the same app as warmup
- You want to know which registries were checked and which refused
- You want every listing found within a published sweep interval
- You do not want a plan limit on monitors
Mailivery
Mailivery is the better fit if
- You want the larger stated list count
- You want an alert when you are delisted
- You want the larger stated number of lists
- You want a notice when a listing clears
- You want blacklist checks in the placement report and the health score
Questions
How many blocklists does Warmerly check?
16 registries: 6 for domains and 10 for IPs.
How many does Mailivery monitor?
70+ on its blacklist and home pages. Its comparison page says 100+.
Which registries does Warmerly check?
Six for domains (Spamhaus DBL, SURBL, URIBL, NordSpam DBL, Spam Eating Monkey URI and s5h) and ten for IPs (Spamhaus ZEN, SpamCop, Barracuda, PSBL, Mailspike, NordSpam, Spam Eating Monkey, Lashback UBL, DroneBL and GBUdb Truncate).
Why does Warmerly not check SORBS?
It shut down in 2024. UCEPROTECT and Invaluement are also left out, as one charges to delist and the other is subscription only.
Does Mailivery name the blacklists it checks?
Not on the pages we read. It says 70+ on most pages and 100+ on its comparison page.
Sources
- Mailivery blacklist monitoring
- Mailivery pricing
- Mailivery competitor comparison
- Mailivery inbox placement test
- Mailivery email warm-up page
Mailivery 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.
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