Warmerly
Up to 4 targets a test, read by folder; no spam filter scores found.
Warmerly
GlockApps
One-to-one · Providers and spam filters tested
Providers and spam filters tested
One row, in depth: what each tool does, the verified numbers, and who each suits.
GlockApps details read from its pricing, home, product, Trust Center, API and MCP pages and help centre on 21 October 2026.
Warmerly
Up to 4 targets a test, read by folder; no spam filter scores found.
GlockApps
Gmail, Outlook, Yahoo, AOL and many more, scored by 5 filters: SpamAssassin, Barracuda, Microsoft EOP, Proofpoint and Google.
The short answer
Providers and spam filters tested, in one look.
Warmerly tests up to 4 targets at a time and reports the folder each message landed in, with no spam filter scoring. GlockApps names many mailbox providers and five spam filters in its test reports. GlockApps is ahead here. Last checked 22 October 2026.
GlockAppsGlockApps ahead on this row
Gmail, Outlook, Yahoo, AOL and many more, scored by 5 filters: SpamAssassin, Barracuda, Microsoft EOP, Proofpoint and Google.
The picture
Drawn side by side.
What each reads
Where the result comes from
WarmerlyGlockApps
Folders at up to 4 targets
- Inbox
- Promotions
- Spam
- Junk
Providers and filters on a seed list
- Inbox
- Spam folder
- Sub-folders
- 5 filter scores
Its pages give different provider counts, so check the current list for the providers your buyers use.
How Warmerly does it
Warmerly, in detail.
A small test, read from the target mailboxes' folders.
01
Up to 4 targets
A test picks up to 2 targets at the sender's own provider and 2 at others.
Warmerly product, checked 21 October 2026
02
Folders, not filters
A test searches Inbox, Promotions, Spam and Junk for the message and scores inbox 100, promotions 60, spam 10 and missing 0.
Warmerly product, checked 21 October 2026
03
No filter scoring found
We found no SpamAssassin, Barracuda or similar score in the placement code.
Warmerly product, checked 21 October 2026
04
Real targets depend on seeds
With no seed list or eligible customer mailboxes, the test falls back to Warmerly's own mailboxes and is marked Limited accuracy.
Warmerly product, checked 21 October 2026
05
Same provider and others
Of up to 4 targets, up to 2 sit at the sender's own provider and 2 at others, so a Gmail sender is tested at Gmail and at other providers.
Warmerly product, checked 21 October 2026
06
Four folders are searched
Inbox, Promotions, Spam and Junk are searched over IMAP for a message with a unique token in its subject.
Warmerly product, checked 21 October 2026
07
Real targets are possible
The doc lists a mode that uses consenting Gmail and Outlook mailboxes of other customers when a switch is on and at least 2 are eligible. The doc's check on 15 October 2026 found no dedicated seeds in production.
Warmerly product, checked 21 October 2026
08
Fallback is labelled
When the targets are only Warmerly's own mailboxes the run is flagged degraded and the account page shows Limited accuracy, so a reader is told which kind of result they have.
Warmerly product, checked 21 October 2026
How GlockApps does it
GlockApps, in detail.
A long provider list and five named filters.
01
Providers on the testing page
The spam testing page names providers including Gmail, Outlook, Yahoo, AOL, Hotmail, Zoho, Exchange (Office365), Amazon WorkMail, GMX, Protonmail, Mail.ru, Yandex and Naver.
glockapps.com/spam-testing · read 21 October 2026
02
Five spam filters
It names SpamAssassin, Barracuda, Microsoft Exchange Online Protection, Proofpoint and an exclusive Google filter.
glockapps.com/spam-testing · read 21 October 2026
03
The API page says 30+ others
Its API page says placement covers Gmail, Outlook, Yahoo, AOL and 30+ others, and scores from 5 major filters.
glockapps.com/api · read 21 October 2026
04
Free checker providers
Its home page says its free checker lists Gmail, Yahoo, AOL and Outlook.
glockapps.com · read 21 October 2026
05
Google Postmaster
A Google Postmaster Tool connection is listed on the pricing page and the home page.
glockapps.com/pricing · read 21 October 2026
06
27 providers in one list
The Delivery Report lists AOL, Outlook, Yahoo, Gmail, Hotmail, Zoho, Exchange (Office365), Amazon WorkMail, G Suite, ATT.net, Mailto.com, GMX.com, Protonmail, Mail.ru, Yandex.ru, Rambler.ru, Web.de, Freenet.de, T-online.de, Gmx.de, Laposte.net, Seznam.cz, Onet.pl, Interia.pl, O2.pl, Ukr.net and Naver.com, which is 27 names.
glockapps.com/spam-testing · read 22 October 2026
07
Five filters named
SpamAssassin, Barracuda, Microsoft Exchange Online Protection, Proofpoint and a Google filter the page calls exclusive.
glockapps.com/spam-testing · read 22 October 2026
08
Mailbox integration
Mailbox integration over API and SMTP lists Gmail, Google Workspace, Amazon, Mailgun, SendGrid, Outlook, Mailjet, Klaviyo, HubSpot and SparkPost.
glockapps.com/spam-testing · read 22 October 2026
09
Google Postmaster data
Connecting Google Postmaster Tool shows domain metrics, stores them longer than Google's default period and alerts on rising spam rates. The plans list Postmaster users: 1, 1, 5 and 10.
glockapps.com/pricing · read 22 October 2026
10
Its authentication results
The page says domain analytics check blocklisting and DKIM alignment. It does not say whether a test report includes SPF or DMARC results.
glockapps.com/spam-testing · read 22 October 2026
11
A free checker with fewer names
Its free spam checker needs no account, tests a shorter list of providers and lets you share the result by public link.
glockapps.com · read 22 October 2026
What GlockApps does not say
We looked, and found no statement on these. That is about its published pages only, not about the product.
- The exact number of providers
- How many seed mailboxes sit behind each provider
- How many seed mailboxes sit behind each provider
- How a spam score is calculated or which threshold counts as a pass
- Whether a report includes SPF and DMARC results
- Whether the free checker and the paid test use the same seed mailboxes
Where the sources disagree
We report each version rather than pick one.
- The spam testing page lists a set of named providers, while the API page says 30+ others after four named. The wording differs and we could not reconcile the counts.
- The spam testing page names 27 providers in its Delivery Report list, the API page says Gmail, Outlook, Yahoo, AOL and 30+ others, and the home page's free checker says Gmail, Outlook, Yahoo, and the spam checker section adds AOL. We report each and cannot reconcile them.
The numbers
Only what we could verify.
| Measure | Warmerly | GlockApps |
|---|---|---|
| Providers and spam filters tested | Up to 4 targets a test, read by folder; no spam filter scores found. | Gmail, Outlook, Yahoo, AOL and many more, scored by 5 filters: SpamAssassin, Barracuda, Microsoft EOP, Proofpoint and Google. |
| Spam filters scored | None found | 5 named filters |
| Targets per test | Up to 4 | Seed list, size not stated |
| Folders read | Inbox, Promotions, Spam, Junk | Inbox, Spam, Sub-folders |
| Providers named in one list | Up to 4 targets, same provider and others | 27 names |
| Folders read | Inbox, Promotions, Spam, Junk | Inbox, Spam, Sub-folders |
| Postmaster Tool users, Growth | No connection found | 5 |
In practice
What it means for you.
Our reading of the facts above. Not a promise, and not the only reasonable reading.
Filters matter for corporate mail
Barracuda, Proofpoint and Microsoft EOP guard many company inboxes. A test that scores them says something Warmerly's folder check cannot.
Treat provider counts with care
Its pages give different provider counts, so check the current list for the providers your buyers use.
Where your buyers are
If your buyers use company mail guarded by Barracuda, Proofpoint or Microsoft EOP, a filter score tells you something a folder check cannot. If they use Gmail and Outlook, 4 targets read by folder may be enough for a first look.
27 names are not 27 seeds
A provider list tells you the range, not the depth. Without a seed count per provider, a result for Mail.ru could rest on one mailbox or many.
Check the provider you sell into
Run one test through each provider your top 10 accounts use, then compare. GlockApps covers the longer list. Warmerly's targets depend on the sender's provider and the pool.
Regional mail
A sender selling into Germany or Poland meets GMX, Web.de, T-online, Onet and O2 mailboxes. GlockApps names those providers, and Warmerly's targets are not chosen by country, so a test of Warmerly's would not tell you about them.
Who it suits
Pick the one that fits.
Warmerly
Warmerly is the better fit if
- You want a quick folder check on a mailbox you warm
- You do not need filter scores
- You want the test beside the warmup that fixes problems
- Your buyers are mostly on Gmail or Outlook
- You want the folder where the message landed, not a score
- You want a test that starts from the mailbox you send from
GlockApps
GlockApps is the better fit if
- You want scores from named spam filters
- You send to many provider types
- You want Postmaster data beside placement
- You sell into corporate mail and want filter scores
- You send to Europe or Eastern Europe and want regional providers
- You want Google Postmaster metrics beside your tests
- You need a test that names the providers your list actually uses
Questions
Which providers does GlockApps test?
Its spam testing page names Gmail, Outlook, Yahoo, AOL, Hotmail, Zoho and others, and its API page says Gmail, Outlook, Yahoo, AOL and 30+ others (glockapps.com, read 21 October 2026).
Which spam filters does it score?
SpamAssassin, Barracuda, Microsoft Exchange Online Protection, Proofpoint and a Google filter.
Which regional providers does GlockApps list?
Its Delivery Report names providers such as GMX, Web.de, T-online, Yandex, Mail.ru, Seznam, Onet and Naver among 27 (glockapps.com/spam-testing, read 22 October 2026).
Does Warmerly test Promotions?
Yes. A placement test searches Inbox, Promotions, Spam and Junk and scores promotions 60. GlockApps' page names Inbox, Spam and Sub-folders and we did not find Promotions named.
Does GlockApps' free checker cover as many providers?
Its home page says the free checker lists Gmail, Outlook and Yahoo, and the checker section adds AOL (read 22 October 2026). The paid Delivery Report names 27.
Sources
GlockApps 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
- All features
- Starting price (per month)
- Pricing model
- Free plan or trial
- Active warmup (send, open and reply loop)
- Inbox placement and spam tests
- DMARC reporting
- SPF, DKIM and DMARC checks
- Uptime and IP reputation monitors
- Content and spam checks
- Campaign sending
- API and MCP
- Agencies, teams and white label
- Security and data hosting
See it on your own mailbox.
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