Warmerly
SPF, DKIM, DMARC and MX checked every 6 hours per mailbox, with the fix written out. 6 domain and 10 IP blocklists.
Warmerly
Apollo.io
One-to-one · SPF, DKIM, DMARC and blocklist checks
SPF, DKIM, DMARC and blocklist checks
One row, in depth: what each tool does, the verified numbers, and who each suits.
Apollo details read from its pricing page and FAQ, product pages and help centre on 21 October 2026.
Warmerly
SPF, DKIM, DMARC and MX checked every 6 hours per mailbox, with the fix written out. 6 domain and 10 IP blocklists.
Apollo.io
A Good or Fix status for SPF, DKIM and DMARC, with an Authorize button that edits DNS at supported providers. Blocklist checks against over fifty databases, run on request.
The short answer
SPF, DKIM, DMARC and blocklist checks, in one look.
Warmerly checks SPF, DKIM, DMARC and MX for every connected mailbox every 6 hours, writes each failure with a fix, and checks 6 domain and 10 IP blocklists. Apollo shows a Good or Fix status for each domain's SPF, DKIM and DMARC, offers an Authorize button that edits DNS at supported providers, and runs blocklist checks against over fifty databases when you ask. Apollo is ahead on the one-click fix and on the number of blocklists; the pages we read give no schedule for its checks. Last checked 22 October 2026.
Apollo.ioApollo.io ahead on this row
A Good or Fix status for SPF, DKIM and DMARC, with an Authorize button that edits DNS at supported providers. Blocklist checks against over fifty databases, run on request.
The picture
Drawn side by side.
How the records and lists get checked
SPF, DKIM, DMARC and blocklists
WarmerlyApollo.io
WarmerlyEvery 6 hours, on its own
- SPFchecked
- DKIMchecked
- DMARCchecked
- MXchecked
- Blocklists6 domain and 10 IP lists
Apollo.ioRun checkA status you open
- SPFGood or Fix
- DKIMGood or Fix
- DMARCGood or Fix
- BlocklistsOver fifty databases
- FixAuthorize edits DNS
Warmerly writes each failing record out in plain words and can show the record to paste, but does not edit your DNS. Apollo can, at supported providers. Apollo's pages state no schedule for its checks.
On screen
What it looks like.
WarmerlySample data
How Warmerly does it
Warmerly, in detail.
A sweep every 6 hours across every mailbox, with the exact finding and fix, and alerts only for real failures.
01
Every 6 hours, or on demand
The records sweep runs every 6 hours by default across every mailbox that is not dead or paused. The Health tab has a Re-check now option.
Warmerly product, checked 21 October 2026
02
More than does the record exist
SPF is checked for its ending, for the limit of 10 DNS lookups and for broken terms. DKIM is checked for key length (1024 bits or shorter is flagged) and the t=y test flag. DMARC is checked for p=, sp=, pct= and whether rua= is set. MX is checked for presence.
Warmerly product, checked 21 October 2026
03
A written finding with a fix
Each finding has a title, an explanation and a fix. Under a failing SPF or DMARC chip the card can show the record itself with a copy button.
Warmerly product, checked 21 October 2026
04
6 domain and 10 IP blocklists
Warmerly queries 6 domain lists and 10 IP lists by plain DNS lookup. A refused query is never reported as a listing.
Warmerly product, checked 21 October 2026
05
Alerts only for real failures
A hard failure raises an alert with a 24-hour cooldown. A check that could not run shows as unknown, never green.
Warmerly product, checked 21 October 2026
06
18 written findings
The checker can raise 18 distinct findings: 9 for SPF (missing, invalid term, multiple records, allows everyone, neutral, softfail, no all term, too many lookups, near the lookup limit), 3 for DKIM (missing, test mode, weak key), 5 for DMARC (missing, monitor only, no policy, partial pct, no reporting) and 1 for MX.
Warmerly product, checked 21 October 2026
07
Hosted domains are published for you
For a OneMail domain you buy, or connect by nameservers, Warmerly publishes the MX, SPF, DKIM and DMARC records itself. On the manual route it lists them, adds a bounce MX and SPF record and an optional tracking CNAME, and rechecks about every minute until they resolve.
Warmerly product, checked 21 October 2026
08
Where Warmerly is behind
Warmerly does not edit your DNS for you on a mailbox you connect, and it checks 16 blocklists against the over fifty Apollo names. Its IP check also reads the mailbox's SMTP submission host, so large provider hosts are skipped, and reading the true outbound IP from Received headers is not built.
Warmerly product, checked 21 October 2026
How Apollo.io does it
Apollo.io, in detail.
Apollo shows domain authentication status, can fix records at supported DNS providers, and runs blocklist checks on request.
01
A status for each mailbox's domain
Under Sequences, then Diagnostics, Apollo shows the status of each mailbox's domain SPF, DKIM and DMARC records as Good or Fix. The domains page shows how many domains have authenticated SPF, DKIM and DMARC.
knowledge.apollo.io/hc/en-us/articles/5046544644365-Diagnose-and-Fix-Domain-Authentication-on-Apollo · read 21 October 2026
02
Fix with one click at some providers
Click Fix, then Authorize to let Apollo update your DNS records automatically. Not all providers are supported; otherwise you copy the records for manual setup, or forward the instructions to a colleague in a link valid for 24 hours.
knowledge.apollo.io/hc/en-us/articles/5046544644365-Diagnose-and-Fix-Domain-Authentication-on-Apollo · read 21 October 2026
03
Blocklist checks against over fifty databases
Apollo performs real-time checks on over fifty supported blocklist databases, run from Run check beside a mailbox, with results Healthy, Caution, Blocklisted, Pending or Retry.
knowledge.apollo.io/hc/en-us/articles/39530186410125-Manage-Mailboxes-and-Domains-on-Apollo · read 21 October 2026
04
Bought domains are set up for you
When you buy a domain through Apollo, it handles domain authentication, and you give a DMARC email for the reports.
knowledge.apollo.io/hc/en-us/articles/33476090833549-Generate-a-Domain-and-Mailbox-to-Reach-Prospects · read 21 October 2026
05
The deliverability page claims
The page says "SPF, DKIM, and DMARC configured automatically" only when you buy a domain through Apollo, and that blocklist monitoring raises an alert with guided steps.
apollo.io/email-deliverability · read 21 October 2026
06
Guided fixes from the AI Assistant
The deliverability page says the AI Assistant offers guided fixes for send-blocking and authentication errors, and that custom subdomain tracking is offered.
apollo.io/email-deliverability · read 22 October 2026
07
Authentication only for bought domains
The page's FAQ says SPF, DKIM and DMARC are handled only for domains bought through Apollo, and that Apollo enforces authentication before sending, with no detail on how.
apollo.io/email-deliverability · read 22 October 2026
08
Which plans list the tools
The Free card does not list the Deliverability Suite or Domain & Mailbox Purchasing. The Basic card ($49 per seat per month, billed annually), Professional ($79) and Organization ($119, minimum 3 seats) each list Deliverability Suite & Email Warmup and Domain & Mailbox Purchasing.
apollo.io/pricing · read 22 October 2026
09
Credits sit behind some of it
The pricing FAQ says credits cover email warmup and domains and mailboxes among other things, are pooled across the team and expire at the end of each billing cycle. It does not say whether a blocklist check or a record fix uses credits.
apollo.io/pricing · read 22 October 2026
What Apollo.io does not say
We looked, and found no statement on these. That is about its published pages only, not about the product.
- How often Apollo re-checks SPF, DKIM and DMARC on a domain you connect
- Whether MX is checked
- How often blocklists are checked unless you run them
- Which blocklists are included
- Whether a blocklist check or a record fix uses credits
- The split of the over fifty blocklists between domain and IP lists
Where the sources disagree
We report each version rather than pick one.
- Apollo's deliverability page says authentication is set up automatically only when you buy a domain through Apollo, while its help article describes fixing records on a domain you linked yourself. We report both.
- Apollo's pricing page FAQ names the plans Free, Basic, Professional and Custom, while the rendered price cards show Free, Basic, Professional and Organization ($119, minimum 3 seats). Both were read on 2026-10-22 and we cannot say which is current.
- Warmerly's own domain-health note lists the records sweep as every 6 minutes, while the scheduler code sets 6 hours (6 * 60 minutes) and the recheck guard is 6 hours. We use the code.
The numbers
Only what we could verify.
| Measure | Warmerly | Apollo.io |
|---|---|---|
| SPF, DKIM, DMARC and blocklist checks | SPF, DKIM, DMARC and MX checked every 6 hours per mailbox, with the fix written out. 6 domain and 10 IP blocklists. | A Good or Fix status for SPF, DKIM and DMARC, with an Authorize button that edits DNS at supported providers. Blocklist checks against over fifty databases, run on request. |
| Record check schedule | Every 6 hours | Not stated |
| Records checked | SPF, DKIM, DMARC and MX | SPF, DKIM and DMARC |
| Blocklists | 6 domain and 10 IP lists | Over fifty databases |
| Fix at the DNS provider | Copy the record yourself | Authorize button at supported providers |
| Alert cooldown | 24 hours | Not stated |
| Blocklist sweep | Every 6 hours | When you run it; schedule not stated |
| Written findings | 18 kinds | Good or Fix per record |
| Entry paid plan | Starter, $19 a month billed monthly | Basic, $49 per seat per month billed annually |
In practice
What it means for you.
Our reading of the facts above. Not a promise, and not the only reasonable reading.
Warmerly watches, Apollo can also repair
If your DNS is at a provider Apollo supports, one click can fix a record. Warmerly tells you what is wrong and what to paste.
Breadth against schedule
Apollo names far more blocklists but runs them when asked. Warmerly checks fewer lists on a 6-hourly sweep.
What 6 hours means in a day
A 6-hour sweep is 24 / 6 = 4 record checks and 4 blocklist sweeps per mailbox per day. Apollo's pages give no interval, so there is no figure to set against it.
How many lists
Warmerly queries 6 + 10 = 16 lists. Apollo says over fifty, so at least 51, which is more than 3 times as many (51 / 16 is about 3.2). More lists means more places a listing can be found, though a listing on a small list matters less than one on a large one, and neither page ranks the lists.
Who it suits
Pick the one that fits.
Warmerly
Warmerly is the better fit if
- You want a regular schedule and a written fix on every mailbox
- You want alerts only for real failures
- You want to see how many blocklists answered, so a partial result is never shown as clean
Apollo.io
Apollo.io is the better fit if
- You want DNS records fixed for you at a supported provider
- You want a wider blocklist check
- You want the AI Assistant to walk you through a send-blocking error
Questions
Does Apollo.io check SPF, DKIM and DMARC?
Yes. Its Diagnostics page shows Good or Fix for each domain's SPF, DKIM and DMARC, with an Authorize button for automatic fixes at supported providers.
How often does Warmerly check DNS?
Every 6 hours by default, or on demand from the mailbox's Health tab.
Does Warmerly fix my DNS records for me?
Not on a mailbox you connect. It shows the exact SPF or DMARC record to paste for Google and Microsoft mailboxes. For a OneMail domain bought through Warmerly or connected by nameservers, it publishes the records itself.
Does Apollo.io check DNS on a schedule?
The pages we read give no schedule for the SPF, DKIM and DMARC status, and blocklist checks run when you press Run check. The deliverability page also says blocklist monitoring raises alerts, without an interval.
Which Apollo plans have the deliverability tools?
The price cards list the Deliverability Suite on Basic, Professional and Organization. The pricing FAQ names the plans Free, Basic, Professional and Custom instead of Organization, so check the live plan before relying on it.
Sources
- Apollo help: Diagnose and Fix Domain Authentication
- Apollo help: Manage Mailboxes and Domains on Apollo
- Apollo help: Generate a Domain and Mailbox
- Apollo email deliverability page
- Warmerly plans and limits (product docs)
- Apollo pricing page and FAQ
- Warmerly OneMail help (product docs)
Apollo.io 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.
See it on your own mailbox.
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