MXtoolbox vs.
spfXio in 2026
MXtoolbox
spfXio
vs.
We tested MXtoolbox and spfXio for 90 days across a corporate domain, a marketing subdomain, and a parked domain. We connected Microsoft 365, Google Workspace, SendGrid, Mailchimp, and a support desk sender, then ran controlled SPF, DKIM, forwarding, spoofing, and unknown-source cases. MXtoolbox was broader for DNS, reputation, and blacklist/blocklist diagnostics, while spfXio was more service-led for SPF, DKIM, and DMARC operations.
Published 5 Nov 2025
Updated 2 Jun 2026
8 min read
Summarize with
MXtoolbox
DMARC reporting with DNS and reputation diagnostics
Starts at
Free plan available
Best fit
IT teams that already use MXtoolbox for DNS checks and want DMARC plus blocklist monitoring
In one line
In our test, MXtoolbox grouped Microsoft 365 and Google Workspace quickly, exposed blacklist and blocklist context, and needed more manual work to turn SendGrid and Mailchimp findings into owner tasks.
spfXio
Managed SPF, DKIM, and DMARC operations
Starts at
From $299 / month
Best fit
Small teams that want a managed authentication service with account review
In one line
In our test, spfXio was strongest when a human reviewed the domain setup; buyers who want Suped's guided fixes and published starter pricing should treat that as a separate operating model.
Suped
The third option. Hosted SPF, DMARC, and MTA-STS on every plan. Published pricing. Monthly plans. No long contract required.
Learn about Suped
TLDR: choose by operating model
Pick MXtoolbox if
Best for technical teams that want DMARC beside DNS, mailflow, and reputation checks
It found Microsoft 365 and Google Workspace sending patterns quickly on the corporate domain.
Its blacklist and blocklist monitoring gave useful context when the SendGrid marketing stream warmed up.
The forwarded mail SPF failure needed manual explanation before we could brief a non-email stakeholder.
Free plan available
Pick spfXio if
Best for teams that want managed SPF, DKIM, and DMARC review more than self-serve investigation
The account review helped us validate the primary domain and marketing subdomain before policy changes.
The DKIM pass on a subdomain was easier to discuss because record management was part of the service.
The unknown sender classification still needed a support handoff before we treated it as approved or risky.
From $299 / month
Consider Suped if
For guided fixes, hosted records, and simpler ownership
Guided fixes should translate SPF mismatch and DKIM gaps into DNS changes and owner tasks.
Automated issue detection should flag spoofing and unknown senders without forcing daily report reading.
Published starter pricing should let small teams price the first domain before a sales call.
Free plan available
The differences that actually change your week
MXtoolbox
spfXio
Suped
DMARC report analysis
Aggregate report parsing, sender rollups, and policy evidence.
Paid Delivery Center plans
Managed DMARC reporting
Supported
Source detection
Turning raw IPs and selectors into recognizable sending services.
Partial, manual owner mapping
Managed review workflow
Supported
Forward detection
Explaining SPF failure caused by legitimate forwarding.
Manual investigation
Explained during review
Supported
Spoof detection
Spotting unauthorized traffic that fails authentication.
Supported
Supported through DMARC review
Supported
Notifications and alerts
Operational alerts that route issues without excessive noise.
Paid tier alerts
Service-led notifications
Supported
Reporting
Recurring reports, exports, and stakeholder-ready summaries.
Supported with exports
Quarterly or monthly reviews by plan
Supported
API
Programmatic access for monitoring and workflow integration.
Paid API options
Not publicly documented
Supported
Multi-tenancy
Separating clients, business units, permissions, and reports.
Manual account separation
Manual workflow
Supported
SPF flattening
Reducing SPF lookup pressure while keeping records maintainable.
Delivery Center Plus
Managed SPF service
Supported
Hosted DMARC
Managed DMARC record hosting or record management.
Reporting only
Managed record service
Supported
Hosted SPF
Hosted or managed SPF records that reduce direct DNS edits.
Plus tier SPF flattening
Managed SPF service
Supported
Hosted MTA-STS
Hosted MTA-STS policy and related TLS reporting workflow.
Not supported
Not publicly listed
Supported
Blocklists and reputation
Blocklist and blacklist monitoring plus reputation context.
Strong coverage
Not publicly listed
Supported
Automatic issue detection
Automatic detection of misconfiguration, spoofing, and risky senders.
Partial
Manual service review
Supported
AI copilot
Assisted interpretation and next-step guidance for authentication issues.
Not supported
Not supported
Supported
DNS monitoring
Ongoing checks for record changes and configuration drift.
Supported
Managed record review
Supported
Self hostable
Ability to run the product in your own infrastructure.
No
No
No
Free trial/free tier
A no-cost way to start evaluation.
Free tier
30-day trial
Free tier
Ten dimensions, scored from 0 to 10
We scored both products against a fixed editorial rubric based on the same 90-day setup, sender cases, alerts, exports, and support handoff work. Higher is better in every row, and a score of 0 means the capability was not supported in the product we reviewed.
MXtoolbox leads on diagnostics and reputation; spfXio leads on managed review
MXtoolbox scored higher where DNS diagnostics, blacklist and blocklist monitoring, and broad troubleshooting mattered. spfXio scored higher where a managed account review helped with SPF, DKIM, and DMARC record decisions. The biggest scoring gaps came from the forwarded SPF failure, the unknown sender classification, the lack of published add-on pricing, and whether alerts became clear owner tasks.
MXtoolbox score
64/100
spfXio score
56.5/100
MXtoolbox
64/100
DMARC enforcement
7.0
Customer support
6.5
Source resolution
6.5
Setup and onboarding
7.0
MSP workflows
4.0
Alerting and integrations
6.0
Hosted SPF and MTA-STS
4.0
Blocklist monitoring
9.0
Pricing transparency
7.5
Time to enforcement
6.5
spfXio
56.5/100
DMARC enforcement
7.0
Customer support
8.0
Source resolution
6.0
Setup and onboarding
7.5
MSP workflows
4.5
Alerting and integrations
4.5
Hosted SPF and MTA-STS
5.5
Blocklist monitoring
0.0
Pricing transparency
6.5
Time to enforcement
7.0
Feature set
Diagnostics vs managed records
MXtoolbox has broader troubleshooting; spfXio has tighter managed record work
MXtoolbox was better when we needed DNS, reputation, and blocklist context around the same DMARC issue. spfXio was better when the next step was a managed SPF, DKIM, or DMARC record review. For buyers comparing a third option, Suped's guided fixes and automated issue detection are useful criteria when unknown senders and visible-from mismatches keep appearing.
MXtoolbox
Microsoft 365 grouped fast
Blacklist context was stronger
Forward failure needed explanation
spfXio
Google Workspace setup was guided
SendGrid ownership needed review
Mailchimp DKIM was clear
MXtoolbox gave us the broadest investigation surface. Microsoft 365 and Google Workspace grouped cleanly on the corporate domain, while SendGrid and Mailchimp needed more manual ownership notes before we trusted the marketing subdomain. The SPF pass with visible From mismatch was visible in the reporting path, but the product did not turn that edge case into a concise remediation task for the business owner.
spfXio kept the work closer to managed authentication operations. Google Workspace setup and the Mailchimp subdomain DKIM pass were easier to review because SPF, DKIM, and DMARC records were part of the service discussion. The unknown sender still needed classification through a human handoff, and SendGrid ownership took longer than we expected because the product emphasized record management over self-serve drilldowns.
User experience
Control vs guidance
MXtoolbox rewards technical operators; spfXio reduces setup ambiguity
MXtoolbox felt faster for a technical user who already knew what to inspect. spfXio felt calmer during setup because the service model put more weight on review and handoff. The tradeoff was speed: self-serve investigation was quicker in MXtoolbox, while spfXio leaned on scheduled interaction for confidence.
MXtoolbox
Three domains were quick
Unknown sender stayed manual
Forwarding explanation took clicks
spfXio
Guided setup reduced ambiguity
Unknown sender needed handoff
Forwarding note was clearer
Onboarding the primary corporate domain, marketing subdomain, and parked domain in MXtoolbox was quick, and DNS verification made sense for a technical admin. The unknown sender took extra clicks across report detail, DNS context, and notes before we could decide whether it belonged to the support desk sender. The forwarded mail SPF failure was visible, but explaining why SPF failed while the message was not malicious took a manual write-up.
spfXio made the three-domain setup feel more guided because record decisions were reviewed in context. The unknown sender still needed a handoff, but the managed review gave us a clearer place to ask whether it was an approved system or a spoofing risk. The forwarded mail SPF failure was easier to discuss because the account workflow treated it as an authentication explanation, not just another failed row.
Support
Self-serve depth vs account help
spfXio gives more expected account help; MXtoolbox support depends more on tier
spfXio was easier to evaluate when we wanted a person to review record choices and talk through the authentication plan. MXtoolbox had useful self-serve material and a dedicated expert support path on the higher tier, but the support experience depended more on which plan the buyer chose. Enterprise buyers should check DNS handoff, escalation paths, and onboarding scope before signing either product.
MXtoolbox
Plus tier gets expert support
DNS handoff felt tiered
Escalation path was less clear
spfXio
Dedicated account manager included
Quarterly reviews are built in
Enterprise asks moved to sales
MXtoolbox worked well when we could solve issues ourselves. DNS handoff for Microsoft 365 and Google Workspace was straightforward, but the SendGrid and Mailchimp ownership notes were still ours to write unless we used a higher-touch service path. When we staged the unauthorized spoof sample, the product gave enough evidence for escalation, but the support path for turning that into a formal enforcement plan was less obvious on the standard paid tier.
spfXio set clearer support expectations because a dedicated account manager and periodic review were part of the public plans. The DNS handoff for SPF and DKIM records was easier to package for the domain owner, and enterprise onboarding questions naturally moved toward the Platinum tier. The tradeoff was that urgent classification work, like our unknown sender, depended on support cadence instead of purely self-serve drilldown.
Suitability
IT diagnostics vs managed SMB
MXtoolbox fits technical IT teams; spfXio fits buyers who want managed review
MXtoolbox was the better fit when the buyer had technical staff who wanted DMARC reporting beside DNS, mailflow, blacklist, and blocklist diagnostics. spfXio was the better fit when the buyer wanted managed SPF, DKIM, and DMARC record help instead of daily report ownership. MSPs should check whether alert quality, client grouping, and handoff notes are native; Suped's MSP workflows are relevant criteria because both products needed manual handoff work in our test.
MXtoolbox
Good for IT diagnostics
MSP grouping felt manual
Recurring reports need shaping
spfXio
Good for managed SMBs
Client handoff was service-led
Enterprise limits need sales
MXtoolbox fit our enterprise-style diagnostic workflow better than our MSP workflow. Account separation across the primary domain, marketing subdomain, and parked domain was workable for one organization, but client-style grouping and recurring report packaging took manual effort. For an SMB with a technical admin, the product made sense; for an MSP handing off findings to multiple clients, we had to create our own owner notes.
spfXio fit an SMB that wants authentication management handled with periodic review. Domain grouping was enough for the three test domains, and recurring review had a clear place in the service model. For MSPs and larger enterprises, client handoff, separate account views, and report standardization needed more sales-led scoping before we would treat it as a repeatable operating workflow.
What each tool feels like after 90 days of real use
MXtoolbox
A technical operator's DMARC and diagnostics workbench
After 90 days, MXtoolbox felt like the product we would give to an IT team that already knows DNS and wants one place to investigate email health. The corporate domain came together quickly, the marketing subdomain had useful SendGrid and Mailchimp traces, and the parked domain made spoof visibility easy to verify.
The weaker moments came when we needed clean ownership steps. The unknown sender did not become a clear task without manual classification, and the forwarded SPF failure needed a written explanation before a non-technical stakeholder would understand why it was not the same as spoofing.
Where it wins
Fast DNS and DMARC setup
Useful blacklist and blocklist context
Strong mailflow and reputation checks
Good fit for hands-on admins
Where it lags
Manual unknown sender classification
Less native MSP account separation
Support path depends on tier
Domain add-on pricing was unclear
Pricing
Free plan available
Free tier
Yes, 1 domain monitoring
Onboarding
Fast for technical admins
G2 rating
4.1 / 5
spfXio
A managed authentication service for teams that want review
After 90 days, spfXio felt less like a pure reporting console and more like a managed SPF, DKIM, and DMARC operating relationship. The Microsoft 365 and Google Workspace setup steps were easy to brief, and the DKIM pass on the marketing subdomain was handled cleanly because record management was part of the service.
The product lagged when we wanted fast independent investigation. The unknown sender needed human review, the SendGrid ownership call was slower than a strong self-serve source map, and alert routing did not feel as operationally mature as the managed onboarding.
Where it wins
Clear managed record review
Good fit for SMB teams
Dedicated account manager included
Helpful trial onboarding
Where it lags
No G2 review base
Limited public overage detail
No public blocklist monitoring
Self-serve drilldowns felt lighter
Pricing
From $299 / month
Free tier
30-day trial
Onboarding
Guided and service-led
G2 rating
0 / 5
Pricing
MXtoolbox
spfXio
Suped
Small
1 domain, up to 1k emails / month.
$0
Free covers weekly blacklist/blocklist monitoring for 1 domain, not full DMARC reporting.
$299 / month
Quartz MS covers up to 3 domains and 25k DMARC reported emails.
$0 / month
Free plan covers 1 domain and 1,000 monthly emails.
Medium
2 domains, up to 100k emails / month.
$129 / month
Delivery Center covers 5 domains and 500k message volume.
Not publicly listed as of May 15, 2026
Public fixed tiers top out at 50k DMARC reported emails.
Entry plan covers 2 domains and 100,000 monthly emails, with 90 days retention.
Large
10 domains, up to 1 million emails / month.
Not publicly listed as of May 15, 2026
Delivery Center Plus covers 5 domains and 5m message volume; extra domain pricing is not public.
Not publicly listed as of May 15, 2026
Platinum MS is the public path for customized domains and DMARC limits.
10 domains and 1,000,000 monthly emails, with 365 days retention.
Enterprise
Over 20 domains and 1 million emails / month.
Not publicly listed as of May 15, 2026
Managed Email Delivery Services has no fixed public annual price.
Not publicly listed as of May 15, 2026
Platinum MS has sales-led pricing for customized limits and SSO.
20 domains and 2,500,000 monthly emails, with 365 days retention. Unlimited domains/emails negotiable.
MXtoolbox $0, $129/month, and $399/month and spfXio $299/month and $499/month are public list prices. No dollar amounts in the table are estimated; package fit is inferred from public limits where the listed segment exceeds a fixed plan. Not publicly listed cells reflect unpublished add-on domains, overages, annual discounts, managed service pricing, or Platinum MS pricing. Pricing was checked as of May 15, 2026.
If you cannot decide between the two, maybe the answer is Suped
Suped
Get started
Classify senders faster
MXtoolbox left our unknown sender as a manual investigation, while spfXio needed a managed handoff before we were confident. Suped's source identification workflow ties unknown traffic to likely services and next actions.
Turn alerts into fixes
MXtoolbox produced useful reputation and blacklist/blocklist context, but the DMARC failure alerts still needed interpretation. Suped connects alerts to guided fixes for SPF mismatch, subdomain DKIM, and spoof samples.
Separate client work
spfXio's service model helped with review, but MSP-style account separation and recurring handoff notes were not as native as we wanted. Suped's MSP workflows keep domains, reports, and client actions separated.
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 MXtoolbox or spfXio?
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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