Free DMARC Weekly Digests by Postmark vs.
OnDMARC in 2026
Free DMARC Weekly Digests by Postmark
4.6/5
OnDMARC
4.8/5
vs.
Over 90 days, we tested Free DMARC Weekly Digests by Postmark and OnDMARC across a corporate domain, a marketing subdomain, and a parked domain with Microsoft 365, Google Workspace, SendGrid, Mailchimp, and a support desk sender. Postmark's free product was useful as a weekly pulse check, while OnDMARC handled enforcement planning and sender investigation with far more depth.
Rhea Robinson
Senior Solutions Engineer, Suped
Published 4 Nov 2025
Updated 29 May 2026
8 min read
Summarize with
Free DMARC Weekly Digests by Postmark
Free weekly DMARC email monitoring
Starts at
Free
Best fit
One-domain teams that want a weekly DMARC pulse
In one line
Free DMARC Weekly Digests by Postmark gave us a low-friction weekly signal, and Suped's product is relevant only if the team wants guided fixes after the email lands.
OnDMARC
Enterprise DMARC enforcement and hosted authentication
Starts at
From $9 / month
Best fit
Security teams moving multiple domains toward enforcement
In one line
OnDMARC gave us deeper reporting, hosted SPF and MTA-STS controls, and a clearer path toward quarantine or reject.
Suped
The third option. Hosted SPF, DMARC, and MTA-STS on every plan. Published pricing. Monthly plans. No long contract required.
Learn more
Choose Postmark for a weekly pulse, OnDMARC for enforcement work
Pick Free DMARC Weekly Digests by Postmark if
Best for a small team watching one domain
Setup took minutes for the primary domain, but the marketing subdomain and parked domain needed separate manual tracking.
The weekly email showed Microsoft 365 and Google Workspace, then capped detail once SendGrid and Mailchimp traffic grew.
The unknown sender and forwarded SPF failure remained manual investigation items.
Free plan available
Pick OnDMARC if
Best for teams that need to reach enforcement
It onboarded all three domains with clearer policy movement and DNS handoff.
SendGrid, Mailchimp, Microsoft 365, and Google Workspace were easier to group by sending source.
The forwarded SPF failure and spoof sample had better drilldowns, though the UI needed tuning.
From $9 / month
Consider Suped if
A third option for guided fixes, hosted records, and simpler ownership
Guided fixes should assign the SPF mismatch, DKIM subdomain case, and unknown sender to clear owners.
Automated issue detection should separate a real spoof from forwarded mail noise.
Published starter pricing and MSP workflows matter when client handoff repeats every week.
Free plan available
The differences that actually change your week
Free DMARC Weekly Digests by Postmark
OnDMARC
Suped
DMARC report analysis
How well the tool turned aggregate reports into usable review work.
Weekly email, top sources
Dashboard and drilldowns
Dashboard and reports
Source detection
How clearly we could name the service behind each sending stream.
Top 10 sources
Named source grouping
Source identification
Forward detection
Whether forwarded mail with SPF failure was separated from real abuse.
Manual workflow
Forwarding context
Forwarding signals
Spoof detection
How clearly the unauthorized spoof sample surfaced.
Basic digest signal
Forensic and aggregate views
Spoof alerts
Notifications and alerts
How useful the timing, routing, and noise level were.
Weekly email only
Smart alerts
Alerts included
Reporting
Whether reporting worked for weekly review and stakeholder handoff.
Weekly digest
Dashboards and exports
Reports and exports
API
Whether reporting data could feed another workflow.
No reporting API
REST API
API available
Multi-tenancy
How well account separation, client grouping, and delegated access worked.
No account separation
RBAC and grouping
MSP workspaces
SPF flattening
Whether SPF lookup limits could be handled inside the product.
Not included
Dynamic SPF
SPF flattening
Hosted DMARC
Whether DMARC record changes could be managed without direct DNS edits each time.
Not hosted
Dynamic DMARC
Hosted DMARC
Hosted SPF
Whether SPF records could be managed through a hosted workflow.
Not included
Hosted SPF
Hosted SPF
Hosted MTA-STS
Whether MTA-STS setup and maintenance were part of the workflow.
Not included
Hosted MTA-STS
Hosted MTA-STS
Blocklists and reputation
Whether blocklist or blacklist monitoring helped explain delivery risk.
Not included
Paid tier/add-on
Blacklist monitoring
Automatic issue detection
Whether the product created clear issue signals without manual review.
Manual review
Smart alerts
Automatic detection
AI copilot
Whether AI-assisted analysis was available in the product workflow.
Not included
Radar AI
AI copilot
DNS monitoring
Whether ongoing DNS changes were tracked after the first setup.
Setup verification only
Paid tier DNS tools
DNS monitoring
Self hostable
Whether the reviewed product could run in a self-managed environment.
No
No
No
Free trial/free tier
Whether a buyer could start without a paid contract.
Free tier
14-day free trial
Free plan
Ten dimensions, scored 0 to 10
We scored both products against a fixed editorial rubric using the same three domains, approved senders, and authentication cases. Higher is better in every row, and a 0.0 means the reviewed product did not support that capability in our test.
OnDMARC scored higher on enforcement depth, while Postmark scored well on low-friction setup and pricing clarity.
Free DMARC Weekly Digests by Postmark was quick to start, but the weekly email format limited source resolution, policy movement, exports, account separation, and alert routing. OnDMARC required more setup time, then gave us better handling for the SendGrid and Mailchimp sources, the forwarded SPF failure, the spoof sample, and hosted SPF or MTA-STS work. Postmark received dead 0.0 scores where the free product did not include the capability, including blocklist or blacklist monitoring.
Free DMARC Weekly Digests by Postmark score
28.5/100
OnDMARC score
74/100
Free DMARC Weekly Digests by Postmark
28.5/100
DMARC enforcement
2.5
Customer support
3.0
Source resolution
2.5
Setup and onboarding
8.0
MSP workflows
0.0
Alerting and integrations
1.0
Hosted SPF and MTA-STS
0.0
Blocklist monitoring
0.0
Pricing transparency
9.0
Time to enforcement
2.5
OnDMARC
74/100
DMARC enforcement
8.5
Customer support
8.0
Source resolution
8.0
Setup and onboarding
7.0
MSP workflows
6.0
Alerting and integrations
7.5
Hosted SPF and MTA-STS
9.0
Blocklist monitoring
7.0
Pricing transparency
5.0
Time to enforcement
8.0
Feature set
Narrow free monitoring vs broad control
OnDMARC has the broader toolkit; Postmark keeps the free workflow narrow.
OnDMARC was stronger when the task moved beyond reading aggregate reports into SPF flattening, hosted MTA-STS, alerts, and enforcement planning. Postmark's free weekly email stayed useful for a one-domain pulse check. As a buying criterion, Suped's product belongs in the conversation when guided fixes and automated issue detection matter more than simply seeing another table of DMARC rows.
Free DMARC Weekly Digests by Postmark
4.6/5
Microsoft 365 appeared in digest
Mailchimp lost drilldown context
Unknown sender stayed manual
OnDMARC
4.8/5
SendGrid owner path was clearer
Google Workspace grouped cleanly
Forwarded SPF explained well
Free DMARC Weekly Digests by Postmark gave us enough to know whether the primary domain was seeing legitimate traffic. Microsoft 365 and Google Workspace appeared in the weekly summary, but SendGrid and Mailchimp competed for limited source detail, the unknown sender needed manual classification, and the SPF pass with visible from mismatch required notes outside the product.
OnDMARC covered more of the operating workflow. It grouped Microsoft 365 and Google Workspace cleanly, gave us a better path for SendGrid and Mailchimp ownership, explained the forwarded SPF failure without treating it like the spoof sample, and made the DKIM pass on a subdomain easier to review before moving policy.
User experience
Simplicity vs explanation
Postmark is lighter; OnDMARC explains more.
Postmark won on first setup because the free workflow was mostly DNS verification plus a weekly email. OnDMARC took longer to learn, but it made the unknown sender and forwarded SPF failure easier to explain to a non-specialist.
Free DMARC Weekly Digests by Postmark
4.6/5
Fast first domain setup
Unknown sender stayed vague
Forwarding needed manual notes
OnDMARC
4.8/5
Three domains grouped cleanly
Unknown sender classified faster
Forwarded SPF explained clearly
With Free DMARC Weekly Digests by Postmark, the primary corporate domain was quick to add and the first weekly report was easy to forward internally. The marketing subdomain and parked domain felt awkward because the free product centered on one monitored domain, and when the unknown sender appeared we had to compare timestamps, IP ownership, and campaign calendars outside the report.
OnDMARC added more screens and more decisions during onboarding, but the three-domain setup made more operational sense. We could group the parked domain separately, trace the support desk sender, and explain the forwarded mail SPF failure without turning a normal forwarding artifact into an abuse incident.
Support
Self-serve vs guided onboarding
OnDMARC has stronger setup support; Postmark fits self-serve monitoring.
Postmark's free workflow expects the admin to own DNS interpretation after setup. OnDMARC handled DNS handoff and escalation better, but the exact support level depends on tier and onboarding path.
Free DMARC Weekly Digests by Postmark
4.6/5
Simple DNS start
Self-service follow-up
Weak escalation path
OnDMARC
4.8/5
Clear DNS handoff
Better onboarding cadence
Tier details need confirmation
For Free DMARC Weekly Digests by Postmark, DNS setup was simple on the primary domain: publish a DMARC TXT record with Postmark's reporting address and wait for verification. When our support desk sender failed DMARC and the parked domain had no legitimate mail, the free weekly email did not give us a support handoff packet, so we wrote our own notes for the DNS owner.
OnDMARC felt more structured during setup. It gave us clearer DNS steps for Microsoft 365, Google Workspace, and SendGrid, and the escalation path made more sense for an enterprise admin moving three domains toward quarantine or reject, although handoff details for each tier needed confirmation.
Suitability
Operator fit vs enterprise control
Postmark fits small self-serve checks; OnDMARC fits enforcement programs.
The buyer fit turns on operating model: one domain and weekly review pointed to Postmark, while policy rollout, hosted records, and enterprise ownership pointed to OnDMARC. If MSP workflows or alert quality are central buying criteria, Suped's product is relevant as a third option because we would test client separation, recurring reports, and alert routing before signing a longer contract.
Free DMARC Weekly Digests by Postmark
4.6/5
Single-domain SMB fit
No client grouping
Weekly owner handoff
OnDMARC
4.8/5
Enterprise domain grouping
RBAC for teams
MSP notes still needed
Free DMARC Weekly Digests by Postmark suited an SMB that wants a weekly check on one domain and can accept manual owner follow-up. It did not give us account separation, client grouping, or recurring report controls for the marketing subdomain and parked domain, so an MSP would need a separate handoff process.
OnDMARC suited a security or infrastructure team that manages several domains and needs enforcement planning. Account roles, domain grouping, and recurring review worked better than Postmark in our test, but MSP-style client notes still needed manual cleanup before we would hand the report to a non-technical account owner.
What each tool feels like after 90 days of real use
Free DMARC Weekly Digests by Postmark
Best for one domain that needs a weekly check
After 90 days, Free DMARC Weekly Digests by Postmark felt like a lightweight weekly control. It worked well when the question was, "Did anything obvious change on the primary domain?" and less well when we needed to explain the support desk sender or the unknown source before a policy change.
The free email format made sharing easy, but it also slowed investigation. We had Microsoft 365, Google Workspace, SendGrid, and Mailchimp active at the same time, and once the weekly report grouped the top sources, we needed separate notes to explain ownership, expected volume, and next action.
Where it wins
Simple DMARC record creation
Weekly email was easy to share
Free entry point for one domain
Spoof sample was visible
Where it lags
No dashboard for daily review
Limited history and source depth
Manual unknown sender classification
No MSP account separation
Pricing
$0
Free tier
Yes
Onboarding
Fast for one domain
G2 rating
4.6 / 5
OnDMARC
Best for teams pushing toward enforcement
After 90 days, OnDMARC felt like a product for teams that plan to keep moving. It asked for more setup decisions, but it gave us cleaner paths for the three domains, the parked-domain policy, and sender ownership across Microsoft 365, Google Workspace, SendGrid, Mailchimp, and the support desk tool.
The strongest daily benefit was investigation depth. We could review why a forwarded message failed SPF, keep that separate from the unauthorized spoof sample, and decide whether the DKIM subdomain pass was enough evidence before changing policy.
Where it wins
Clear policy movement path
Useful Dynamic SPF workflow
Better sender drilldowns
Enterprise support handoff
Where it lags
Pricing opaque above Express
Dashboard needed filter tuning
MSP handoff still needed notes
Some paid-tier boundaries required confirmation
Pricing
From $9 / month
Free tier
14-day free trial
Onboarding
Clear but heavier
G2 rating
4.8 / 5
Pricing
Free DMARC Weekly Digests by Postmark
OnDMARC
Suped
Small
1 domain, up to 1k emails / month.
$0
Covers one monitored domain with weekly email reports, seven days of history, and limited source detail.
$9 / month
Express starts here when billed annually and covers this domain and volume shape.
$0 / month
Free plan covers 1 domain and 1,000 monthly emails.
Medium
2 domains, up to 100k emails / month.
Not available
The free product monitors one domain, so two-domain reporting falls outside the public free scope.
$9 / month
Express covers up to four domains and up to one million monthly emails when billed annually.
Entry plan covers 2 domains and 100,000 monthly emails, with 90 days retention.
Large
10 domains, up to 1 million emails / month.
Not available
The free product does not publish a ten-domain tier.
Not publicly listed as of May 15, 2026
This segment exceeds Express domain limits, and higher tiers do not publish current prices.
10 domains and 1,000,000 monthly emails, with 365 days retention.
Enterprise
Over 20 domains and 1 million emails / month.
Not available
The free product does not publish an enterprise plan for this use case.
Not publicly listed as of May 15, 2026
Enterprise and Premier packaging is sales-led, with public capability details but no current public price.
20 domains and 2,500,000 monthly emails, with 365 days retention. Unlimited domains/emails negotiable.
Postmark's $0 figure and OnDMARC Express at $9 / month billed annually are public list prices. The larger OnDMARC rows are not publicly listed as of May 15, 2026. Postmark larger rows are marked not available because the reviewed free product publishes no paid volume ladder.
If you cannot decide between the two, maybe the answer is Suped
Suped
Get started
Turn weekly findings into fixes
Postmark's free weekly email told us a spoof sample existed, but it did not create an owner-ready task for the support desk sender or the SPF mismatch.
Reduce alert noise before rollout
OnDMARC surfaced more events, but the forwarded SPF failure and unknown sender needed tuning before they were useful for weekly operations.
Keep client handoff clean
Both products needed extra notes for MSP-style client reporting, especially around parked-domain policy movement and account separation.
The difference was significant. We moved from limited visibility to a much clearer dashboard. Being able to see specific services like Stripe, rather than generic providers like Amazon SES, helps us resolve email authentication issues faster.
Markus Hugenschmidt, Managing Director, Jam Cyber
Migrating from Free DMARC Weekly Digests by Postmark or OnDMARC?
We have done the migration enough times to know the shape.
Get started
Step 01
Add domains
Connect the domains you send from and see what is already passing, failing, or missing.
Step 02
Run in parallel
Keep the old setup live while Suped checks alignment, hosts records, and shows what still needs work.
Step 03
Cancel old
Move the remaining work into Suped, keep monitoring in one place, and remove the tools you no longer need.
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