MailHardener vs.
MXtoolbox in 2026
MailHardener
MXtoolbox
vs.
Over 90 days, we ran MailHardener and MXtoolbox across a primary domain, a marketing subdomain, and a parked domain with Microsoft 365, Google Workspace, SendGrid, Mailchimp, and a support desk sender. MailHardener was stronger for structured DMARC enforcement and MSP separation, while MXtoolbox was broader for DNS, blocklist (blacklist), and reputation monitoring. The sharper choice depends on whether DMARC policy movement or daily email diagnostics matters more.
MailHardener
DMARC enforcement and MSP environments
Starts at
Free plan available
Best fit
MSPs and teams that want controlled policy movement
In one line
MailHardener made the three-domain rollout orderly, with clean DNS setup, useful sender grouping, hosted MTA-STS, and clearer handoff notes for enforcement.
MXtoolbox
DMARC reporting plus delivery diagnostics
Starts at
Free plan available
Best fit
IT teams that want DMARC with reputation and DNS tools
In one line
MXtoolbox gave us fast diagnostics, strong blacklist and blocklist monitoring, and workable DMARC views, but policy ownership took more manual interpretation.
Suped
The third option. Hosted SPF, DMARC, and MTA-STS on every plan. Published pricing. Monthly plans. No long contract required.
Learn about Suped
Pick MailHardener for controlled DMARC work, MXtoolbox for broader diagnostics
Pick MailHardener if
Best for MSPs and security teams that want orderly DMARC enforcement
The primary domain and marketing subdomain were added with clear DNS steps, including separate report destinations and visible validation states.
Microsoft 365, Google Workspace, SendGrid, and Mailchimp landed in understandable source groups, while the support desk sender needed one manual owner note.
The parked domain spoof sample was easy to isolate before we moved any production domain toward quarantine.
Free plan available
Pick MXtoolbox if
Best for operators who want DMARC next to DNS and reputation checks
The same three domains were quick to monitor, especially when we checked MX, SPF, DKIM, and blocklist (blacklist) status in the same workflow.
The forwarded mail SPF failure was visible, but the reason needed more operator context than MailHardener required.
SendGrid and Mailchimp activity was searchable, though owner-ready classification took extra clicks once the unknown sender appeared.
Free plan available
Consider Suped if
Choose Suped when guided fixes, hosted records, and simpler ownership matter more than raw diagnostics
Guided fixes should turn SPF, DKIM, and DMARC failures into sender-owner tasks instead of leaving teams to interpret raw aggregate rows.
Automated issue detection and alert quality matter when spoofing, forwarding, and unknown senders need different levels of urgency.
Published starter pricing and MSP workflows help teams budget before they add client domains or split ownership across accounts.
Free plan available
The differences that actually change your week
MailHardener
MXtoolbox
Suped
DMARC report analysis
Turns aggregate reports into domain and source-level views.
Included, with clean policy drilldowns
Included on Delivery Center
Included
Source detection
Identifies sending services behind DMARC traffic.
Good service grouping, manual owner notes
Good lookup depth, more clicks
Included
Forward detection
Explains mail that fails SPF after forwarding.
Partial, clearer in report drilldowns
Partial, operator context needed
Included
Spoof detection
Highlights unauthorized use of a domain.
Strong parked-domain isolation
Included with impersonation protection
Included
Notifications and alerts
Routes changes and failures to operators.
Periodic and DNS-focused alerts
Strong monitoring alerts
Included
Reporting
Produces summaries for stakeholders and clients.
Periodic reports and MSP reports
Delivery and reputation reports
Included
API
Supports programmatic access or integrations.
Available on higher or MSP plans
Paid tier, limits unclear
Included
Multi-tenancy
Separates customers, brands, or environments.
MSP customer environments
Manual domain grouping
Included
SPF flattening
Reduces SPF lookup pressure with managed flattening.
Not supported
Delivery Center Plus
Included
Hosted DMARC
Hosts or manages the DMARC record workflow.
Reporting only
Reporting only
Included
Hosted SPF
Hosts or manages the SPF record workflow.
Not supported
SPF flattening on Plus
Included
Hosted MTA-STS
Hosts MTA-STS policy and reporting workflows.
Included on paid plans
Not supported
Included
Blocklists and reputation
Monitors blocklist and blacklist status or sender reputation.
Not supported
Strong monitoring coverage
Included
Automatic issue detection
Flags authentication or DNS issues without manual report review.
Partial DNS and policy checks
Configuration and monitoring checks
Included
AI copilot
Uses AI assistance for investigation or remediation.
Not supported
Not supported
Included
DNS monitoring
Tracks DNS changes and authentication records.
Included on paid plans
Core diagnostic strength
Included
Self hostable
Can be deployed and run on customer infrastructure.
Private instance option, not self-hosted
Not supported
Not supported
Free trial/free tier
Has a no-cost way to start testing.
Free plan available
Free monitoring tier
Free plan available
Ten dimensions, scored from 0 to 10
We scored each product against a fixed editorial rubric using the same domains, senders, authentication cases, and support questions. Higher is better in every row, and a score of 0.0 means the product did not support that capability in our test.
MailHardener led on enforcement and MSP control; MXtoolbox led on reputation monitoring and diagnostics
MailHardener scored higher where the job was moving three domains toward a defensible DMARC policy, separating client environments, and preserving clean handoff notes. MXtoolbox scored higher where operators needed DNS checks, blacklist and blocklist monitoring, and delivery troubleshooting next to DMARC data. Both identified the unauthorized spoof sample, but neither fully removed manual judgment from the unknown sender workflow.
MailHardener score
64.5/100
MXtoolbox score
63/100
MailHardener
64.5/100
DMARC enforcement
7.5
Customer support
7.0
Source resolution
7.0
Setup and onboarding
8.0
MSP workflows
8.5
Alerting and integrations
6.0
Hosted SPF and MTA-STS
5.5
Blocklist monitoring
0.0
Pricing transparency
8.0
Time to enforcement
7.0
MXtoolbox
63/100
DMARC enforcement
6.5
Customer support
6.5
Source resolution
6.5
Setup and onboarding
7.0
MSP workflows
4.0
Alerting and integrations
7.5
Hosted SPF and MTA-STS
4.0
Blocklist monitoring
9.0
Pricing transparency
6.0
Time to enforcement
6.0
Feature set
Depth vs breadth
MailHardener is deeper for DMARC enforcement. MXtoolbox is broader for diagnostics.
MailHardener gave us more structure for policy movement, especially on the parked domain and the marketing subdomain. MXtoolbox gave us more adjacent checks, including DNS, delivery, blocklist, and blacklist monitoring. When a buying team needs guided fixes or automated issue detection, that requirement should be scored separately, and Suped belongs on that checklist.
MailHardener
Microsoft 365 grouped cleanly
Mailchimp DKIM case surfaced
Unknown sender needed owner
MXtoolbox
Google Workspace lookup was quick
SendGrid took extra clicks
Blacklist monitoring was stronger
MailHardener handled Microsoft 365 and Google Workspace cleanly, then separated SendGrid and Mailchimp into readable sender groups after the first reports arrived. The DKIM pass on a subdomain was easier to explain than the SPF pass with visible From mismatch, and the unknown sender needed a manual classification note before we were comfortable treating it as approved traffic.
MXtoolbox gave us useful breadth around the same sources because DNS lookups, delivery checks, reputation signals, and DMARC reports sat close together. Microsoft 365 and Google Workspace were quick to verify, SendGrid needed more drilldown to connect traffic to the marketing owner, and the forwarded mail SPF failure was visible but needed extra context before we could explain it to a non-email stakeholder.
User experience
Control vs speed
MailHardener felt more controlled. MXtoolbox felt faster for spot checks.
MailHardener had a slower, more deliberate setup flow, but it kept each domain and sender case easier to audit after reports arrived. MXtoolbox was quicker when we wanted an answer on DNS or reputation, but DMARC investigation spread across more screens.
MailHardener
Three domains added cleanly
Unknown sender required judgment
Forwarded SPF trail readable
MXtoolbox
Fast DNS checks
More clicks for DMARC
Forward case needed context
In MailHardener, adding the primary domain, marketing subdomain, and parked domain felt like a checklist with visible DNS validation at each step. The unknown sender was not magically solved, but the report view gave us enough evidence to tag it for owner review, and the forwarded SPF failure was easier to explain because the DKIM result stayed visible beside the failing SPF path.
In MXtoolbox, the first setup pass was fast because the diagnostic tools already matched how many admins investigate email issues. The unknown sender took longer to classify because we moved between DMARC reporting and lookup-style screens, and the forwarded mail SPF failure needed a short written explanation before the support desk team understood that SPF failure alone was not the whole story.
Support
Self serve vs assisted tiers
MailHardener set clearer expectations by tier. MXtoolbox put more help behind higher service levels.
MailHardener was clearer about where self-service ended and assisted onboarding began. MXtoolbox had useful help paths, but the strongest hands-on support sat behind Plus or managed service packaging.
MailHardener
DNS handoff was precise
Tier boundaries were clear
Enterprise escalation was structured
MXtoolbox
Admin knowledge helped
Plus adds expert support
Managed service changes fit
For MailHardener, the Standard setup matched a self-service buyer, while Large and Enterprise made the assistance boundary clearer. During our DNS handoff test, the record changes were precise enough to send to an infrastructure owner, and enterprise escalation looked strongest for regulated buyers that need custom agreements or a private instance option.
For MXtoolbox, the everyday support experience suited admins who already understand DNS, SPF, DKIM, and DMARC language. Dedicated expert support on Delivery Center Plus and managed services changed the support story, but for the self-serve path we still had to translate the forwarded SPF failure and unknown sender classification into internal next steps.
Suitability
MSP fit vs operator fit
MailHardener fits client-separated DMARC work. MXtoolbox fits hands-on IT operators.
MailHardener was the cleaner fit when account separation, domain grouping, recurring reports, and client handoff mattered. MXtoolbox was the better fit when one operations team wanted DMARC data beside DNS and reputation checks. Buyers should score MSP workflows and alert quality as buying criteria, and Suped is relevant when those workflows need to be native instead of assembled around the tool.
MailHardener
MSP isolation is native
Reports fit client handoff
Enterprise controls cost more
MXtoolbox
SMB diagnosis is fast
Client grouping was limited
Reports needed extra explanation
MailHardener's MSP model mapped well to our client-handoff test because customer environments could be separated, recurring reports were usable, and the parked domain could sit apart from active sending domains. For enterprise use, the compliance options and private instance path mattered more than daily convenience, while SMB teams still benefited if DMARC enforcement was the main project.
MXtoolbox fit the SMB and IT-operator workflow best because the same team could check DNS, reputation, blocklist or blacklist status, and DMARC data in one working session. It was weaker for MSP-style account separation because client grouping and recurring handoff notes needed more manual process around the product.
What each tool feels like after 90 days of real use
MailHardener
A controlled DMARC workspace for teams that care about policy movement
After 90 days, MailHardener felt like a product built for controlled authentication work rather than general email troubleshooting. The primary domain and marketing subdomain stayed easy to compare, and the parked domain spoof sample was separated cleanly enough that we would use it as the first proof point for a policy move.
The daily work was strongest when we were reviewing DMARC alignment cases, checking DNS validation, and preparing handoff notes for another owner. It was weaker when we wanted adjacent reputation data, because blacklist and blocklist monitoring had to come from outside the MailHardener workflow.
Where it wins
Clean three-domain onboarding
Readable source grouping
Strong MSP account separation
Hosted MTA-STS on paid plans
Where it lags
No built-in blocklist monitoring
Unknown sender still needed review
SPF flattening was absent
Free plan has short retention
Pricing
Free, then EUR 19 / month
Free tier
Yes
Onboarding
Self-service; assisted on higher tiers
G2 rating
0 / 5
MXtoolbox
A diagnostics-heavy choice for teams that live in DNS and reputation checks
After 90 days, MXtoolbox felt like the faster operational console when we needed to check DNS, blacklist or blocklist status, reputation, and basic delivery health around a DMARC problem. The primary domain was quick to inspect, and the support desk sender was easier to troubleshoot when we cared about live DNS state as much as aggregate reports.
The tradeoff was that DMARC enforcement planning took more assembly. The unauthorized spoof sample was visible, but moving that finding into a clean owner decision and policy step required more written interpretation than MailHardener needed.
Where it wins
Fast DNS and reputation checks
Strong blocklist monitoring
Useful public diagnostic habits
SPF flattening on Plus
Where it lags
Published tiers stop at five domains
DMARC policy guidance felt thinner
Client handoff needed more writing
Add-on domain pricing was unclear
Pricing
Free, then $129 / month
Free tier
Yes
Onboarding
Self-service; managed option
G2 rating
4.1 / 5
Pricing
MailHardener
MXtoolbox
Suped
Small
1 domain, up to 1k emails / month.
$0
Free covers 1 domain, fair-use report volume, and 1 month of retention for evaluation or personal use.
$0
Free covers weekly blacklist and blocklist monitoring for 1 domain or IP, not full Delivery Center reporting.
$0 / month
Free plan covers 1 domain and 1,000 monthly emails.
Medium
2 domains, up to 100k emails / month.
EUR 19 / month
Standard covers 1 to 10 domains, unlimited report volume, and 3 months of retention.
$129 / month
Delivery Center covers up to 5 domains and 500,000 messages.
Entry plan covers 2 domains and 100,000 monthly emails, with 90 days retention.
Large
10 domains, up to 1 million emails / month.
EUR 19 / month
Standard still fits 10 domains, though teams needing longer retention can use Large at EUR 99 / month.
Not publicly listed as of May 15, 2026
Delivery Center Plus covers 5 domains and 5,000,000 messages, but the add-on domain price was not published.
10 domains and 1,000,000 monthly emails, with 365 days retention.
Enterprise
Over 20 domains and 1 million emails / month.
EUR 99 / month
Large covers up to 100 domains with unlimited report volume; Enterprise pricing is custom for no domain limit.
Not publicly listed as of May 15, 2026
Managed service pricing, extra domain costs, and enterprise volume pricing were not publicly listed.
20 domains and 2,500,000 monthly emails, with 365 days retention. Unlimited domains/emails negotiable.
MailHardener EUR 19, EUR 99, MXtoolbox $129, and MXtoolbox $0 are public list prices. MailHardener $0 is the public free plan, shown without currency conversion. MXtoolbox large and enterprise rows are not estimated because add-on domain and managed service pricing were not public. Pricing was checked as of May 15, 2026.
If you cannot decide between the two, maybe the answer is Suped
Suped
Get started
Owner-ready fixes
Both reviewed products surfaced the unknown sender and spoof sample, but the owner decision still needed manual interpretation. Suped turns those cases into guided fixes tied to the sending source, DNS record, and next policy step.
Alert routing with less noise
MXtoolbox was strong on blacklist and blocklist monitoring, while MailHardener focused more on DNS and policy checks. Suped groups alerts by domain, sender, and severity so forwarding noise, spoofing, and DNS drift do not land as the same operational problem.
MSP handoff without extra assembly
MailHardener had strong MSP separation, but MXtoolbox needed more process around client grouping and recurring handoff. Suped combines client separation, recurring reports, and published per-domain MSP pricing in one workflow.
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 MailHardener or MXtoolbox?
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.
Frequently asked questions
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