Warmerly
Checked every six hours per mailbox, with a written fix; free DMARC reports, with no alerts.
Warmerly
Mailwarm
One-to-one · SPF, DKIM and DMARC checks
SPF, DKIM and DMARC checks
One row, in depth: what each tool does, the verified numbers, and who each suits.
Mailwarm details read from its pricing page, home page, features page, SMTP warmup page and about page on 21 October 2026.
Warmerly
Checked every six hours per mailbox, with a written fix; free DMARC reports, with no alerts.
Mailwarm
SPF, DKIM and DMARC validation and fix tools are listed; how often it checks is not stated.
The short answer
SPF, DKIM and DMARC checks, in one look.
Warmerly checks SPF, DKIM and DMARC every six hours per mailbox, with a written fix. Mailwarm lists SPF, DKIM and DMARC validation and authentication fix tools in its plans, and does not say how often it checks. Last checked 22 October 2026.
Mailwarm
SPF, DKIM and DMARC validation and fix tools are listed; how often it checks is not stated.
The picture
Drawn side by side.
How the records get checked
SPF, DKIM and DMARC
WarmerlyMailwarm
WarmerlyEvery 6 hours, on its own
- SPFchecked
- DKIMchecked
- DMARCchecked
MailwarmFrequency not stated
- SPFvalidation listed
- DKIMvalidation listed
- DMARCvalidation listed
Warmerly writes the fix for each finding. Mailwarm lists authentication fix tools in its plans.
On screen
What it looks like.
WarmerlySample data
How Warmerly does it
Warmerly, in detail.
Scheduled record checks per mailbox, plus free report collection.
01
Checked every six hours
The records sweep runs every six hours across every mailbox that is not dead or paused. A Re-check now option is on the mailbox Health tab.
Warmerly product, checked 21 October 2026
02
A written fix for each finding
Each finding has a title, an explanation and a fix. SPF is checked for the 10-lookup limit, DKIM for key length and test mode, DMARC for policy and reporting address.
Warmerly product, checked 21 October 2026
03
Unknown is never green
A check that could not run is shown as unknown, not as fine.
Warmerly product, checked 21 October 2026
04
Free DMARC report collection
Point your DMARC reporting address at a Warmerly address to see who sends as your domain and whether they pass, for up to 10 domains per workspace. Email digests and alerts for these reports are not built.
Warmerly product, checked 21 October 2026
05
SPF is checked for quality, not just presence
Beyond whether a record exists, the check reads the all qualifier, counts the 10-lookup budget through include and redirect terms, and flags an ip4 or ip6 term that holds an address of the wrong family, which voids the record.
Warmerly product, checked 21 October 2026
06
DKIM key length and test mode
DKIM is checked for the RSA key length and for the t=y test-mode flag. A selector whose lookup errored gets one retry after five seconds before the result is called an error, since a cold query to a slow nameserver can overrun the first two-second budget.
Warmerly product, checked 21 October 2026
07
DMARC policy, subdomain policy, percentage and reports
The check reads p, sp and pct, and whether a reporting address is set. MX is checked as well, because a sending domain that cannot receive is a spam signal and warmup needs replies.
Warmerly product, checked 21 October 2026
08
The record to paste
Under a failing SPF or DMARC chip the card shows the exact record: type, host, value and a copy button. SPF is suggested for Google and Microsoft mailboxes, merged into the record published now so the old terms stay and the provider is added before the all term. DMARC is suggested as monitor-only p=none when none exists.
Warmerly product, checked 21 October 2026
09
Gmail and Outlook.com addresses are handled honestly
On a shared consumer domain the records belong to the provider, and Gmail signs with a rotating selector that cannot be discovered. So the card shows Connected, nothing to set up, instead of four failures, and the check is not alerted on.
Warmerly product, checked 21 October 2026
10
Advisories never alert, and never turn a domain red
The sweep alerts only on a hard failure. One hard failure makes the verdict amber and two or more make it red. Most healthy domains publish p=none and sit at warn, and mailing all of them about something that did not change would teach people to ignore the alert.
Warmerly product, checked 21 October 2026
11
A stale check is not a pass
A check older than 48 hours, one that errored, or one where no list answered is shown as unknown on the sending-safety pill, never as OK. The records sweep itself runs every six hours.
Warmerly product, checked 21 October 2026
How Mailwarm does it
Mailwarm, in detail.
Validation and fix tools are listed; frequency is not.
01
Validation
Its features page lists SPF, DKIM and DMARC validation.
mailwarm.com/features · read 21 October 2026
02
Fix tools in plans
Authentication fix tools are listed on Starter, Growth and Scale.
mailwarm.com/pricing · read 21 October 2026
03
Free checkers
Free SPF, DKIM and DMARC checkers and generators are linked from its home page.
mailwarm.com · read 21 October 2026
04
SMTP checks
Its features page lists SMTP and IMAP configuration checks, and its SMTP page tells you to check SPF, DKIM and reverse DNS before warming.
mailwarm.com/smtp-warmup · read 21 October 2026
05
An SPF checker that explains the failures
Its SPF checker is free, shows 10 checks remaining today, and reports pass or fail, the record and a suggested fix. It explains the 10-lookup limit, multiple SPF records, a +all or ?all ending, a missing include for your provider, and the difference between permerror and softfail.
mailwarm.com/spf-checker · read 22 October 2026
06
A DMARC checker that explains the policy
Its DMARC checker fetches the record at the _dmarc name, checks syntax, policy and alignment with SPF and DKIM, and shows 10 checks remaining today. It explains p=none, quarantine and reject, the rua, ruf, pct, adkim and aspf tags, and says to start at none, read reports for a week or two, then tighten.
mailwarm.com/dmarc-checker · read 22 October 2026
07
More record types in its deliverability test
Its test reports SPF, DKIM and DMARC with alignment to the From domain, and lists MX, PTR, MTA-STS, TLS-RPT and BIMI among the DNS records covered. It also gives a SpamAssassin score for the message. We did not find these record types described on its plan pages.
mailwarm.com/email-deliverability-test · read 22 October 2026
08
Authentication fix tools in plans
Its pricing page lists authentication fix tools on Starter, Growth and Scale, and its tool page says the account manager helps configure SPF, DKIM and DMARC. Neither says what the fix tools do.
mailwarm.com/pricing; https://mailwarm.com/email-warmup-tool · read 22 October 2026
09
SMTP and IMAP configuration checks
Its features page lists SMTP and IMAP configuration checks and shows a sample of 5 of 6 checks passed, with SMTP Config marked Review. Whether that sample is real data is not stated.
mailwarm.com/features · read 22 October 2026
10
Do the basics first
Its SMTP page says warmup cannot fix a broken setup, so SPF, DKIM, reverse DNS and blacklist status should be checked first. A self-hosted server needs a PTR record that matches its hostname.
mailwarm.com/smtp-warmup · read 22 October 2026
What Mailwarm does not say
We looked, and found no statement on these. That is about its published pages only, not about the product.
- How often records are checked
- Whether it sends alerts when a record breaks
- What the fix tools do
- How often a connected domain is re-checked
- Whether a record change sends an alert
- Whether the free checkers and the plan checks are the same code
- Whether DMARC reports can be read inside the product
Where the sources disagree
We report each version rather than pick one.
- The DMARC checker says at least one of SPF or DKIM must pass and align, while its bulk-sender section lists both, and the page treats them as separate rules.
The numbers
Only what we could verify.
| Measure | Warmerly | Mailwarm |
|---|---|---|
| SPF, DKIM and DMARC checks | Checked every six hours per mailbox, with a written fix; free DMARC reports, with no alerts. | SPF, DKIM and DMARC validation and fix tools are listed; how often it checks is not stated. |
| Record check interval | Every 6 hours | Not stated |
| DMARC reports | Free, up to 10 domains | Not stated |
| Written fix for each finding | Yes | Fix tools, as listed |
| Free checks a day, as shown | Free tools on warmerly.com | 10 for SPF and DMARC, 5 for the email checker |
| SPF lookup limit explained | Yes, counted through include and redirect | Yes, in its SPF checker guidance |
| Record types in the deliverability test | SPF, DKIM, DMARC, MX | SPF, DKIM, DMARC, MX, PTR, MTA-STS, TLS-RPT, BIMI |
| Suggested record to paste | SPF and DMARC, on the card | Generators for SPF, DKIM and DMARC |
| An unreachable check shown as clean | Never, it is shown as unknown | Never, in blocklists it shows Couldn't check |
In practice
What it means for you.
Our reading of the facts above. Not a promise, and not the only reasonable reading.
Both point you at the basics
Mailwarm's SMTP page says warmup cannot fix a broken setup. Warmerly's checks give a written fix per finding, and unknown results are never shown as green.
Mailwarm covers more record types
Its deliverability test lists PTR, MTA-STS, TLS-RPT and BIMI, which Warmerly does not check on customer mailboxes. If your sending depends on reverse DNS on a self-hosted server, that is a real reason to run Mailwarm's free test or its SMTP guidance beside Warmerly.
Watching a record break
A change at your DNS host can break SPF at any hour. With a six-hour sweep, Warmerly reads it within about six hours and alerts on a hard failure. A free checker you visit tells you only what the record is when you visit, so it depends on you remembering to look.
The 10-lookup limit in numbers
A domain that includes Google, a mailing platform and a helpdesk can reach 10 lookups quickly, because nested includes count. Both tools explain the limit. Warmerly counts it on your published record and says when you are over, and Mailwarm's checker explains it and suggests removing unused includes or using ip4 ranges.
Move to p=none, then tighten
Both advise starting DMARC at p=none. Warmerly suggests that record when none exists, and adds free report collection for up to 10 domains per workspace, so you can see who sends as your domain before tightening. Its report digests and alerts are not built. Mailwarm's page tells you to read aggregate reports and does not say its product reads them.
Do the setup before warming a new domain
Mailwarm's own pages say a new domain can score well on authentication and still land in spam without a few weeks of warmup, and that warmup cannot repair a broken setup. Fix the records first, then warm.
Who it suits
Pick the one that fits.
Warmerly
Warmerly is the better fit if
- You want a check every six hours with the fix written out
- You want the exact record written out under a failing check, merged into your current SPF
- You want a hard failure to reach you by email without a visit to a page
Mailwarm
Mailwarm is the better fit if
- You want free checkers and generators alongside the service
- You want PTR, MTA-STS, TLS-RPT and BIMI covered in a free test
- You want long written guidance on SPF, DKIM and DMARC beside each checker
Questions
Does Mailwarm check SPF, DKIM and DMARC?
Its features page lists SPF, DKIM and DMARC validation, and its plans list authentication fix tools. It does not say how often.
Does Mailwarm check MTA-STS and TLS-RPT?
Its free deliverability test lists MTA-STS, TLS-RPT, BIMI and PTR among the DNS records it covers (mailwarm.com/email-deliverability-test, read 22 October 2026). Warmerly does not check them on customer mailboxes.
Why does Warmerly show Connected, nothing to set up on a Gmail address?
On a shared consumer domain the records belong to the provider, and our reading of them would be unreliable, so we do not show false failures for something you cannot change.
Can I see DMARC reports in Warmerly?
Yes, free for up to 10 domains per workspace, by pointing your DMARC reporting address at a Warmerly address. Email digests and alerts for these reports are not built.
Sources
- Mailwarm pricing
- Mailwarm features
- Mailwarm home page
- Mailwarm SMTP warmup
- Mailwarm SPF checker
- Mailwarm DMARC checker
- Mailwarm email deliverability test
- Mailwarm email warmup tool
Mailwarm 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.
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