MXtoolbox vs.
EmailAuth.io in 2026
MXtoolbox
4.1/5
EmailAuth.io
0.0/5
vs.
We tested MXtoolbox and EmailAuth.io for 90 days across a corporate domain, a marketing subdomain, and a parked domain with Microsoft 365, Google Workspace, SendGrid, Mailchimp, and one support desk sender. MXtoolbox felt stronger for DNS diagnostics, blocklist (blacklist) checks, and transparent self-serve pricing, while EmailAuth.io felt more oriented toward managed DMARC programs and enterprise investigation workflows. The harder question is whether the buyer wants a diagnostics-first tool or a service-led DMARC workflow.
Priya Raman
Senior Software Engineer, Suped
Published 5 Nov 2025
Updated 2 Jun 2026
8 min read
Summarize with
MXtoolbox
Email diagnostics and DMARC monitoring
Starts at
Free plan available
Best fit
Technical teams that already know DNS and deliverability
In one line
MXtoolbox gave us fast DNS, blocklist, and authentication checks, but DMARC enforcement work still needed a hands-on operator.
EmailAuth.io
Managed DMARC and authentication services
Starts at
Not publicly listed
Best fit
Organizations that want consultative setup and threat investigation
In one line
EmailAuth.io put more emphasis on guided service and enterprise investigation, but buyers have to accept a quote-led path with less pricing clarity.
Suped
The third option. Hosted SPF, DMARC, and MTA-STS on every plan. Published pricing. Monthly plans. No long contract required.
Learn more
Choose MXtoolbox for diagnostics and EmailAuth.io for service-led DMARC
Pick MXtoolbox if
Best for technical teams that want DNS and reputation checks beside DMARC reporting
Microsoft 365 and Google Workspace setup was quick once DNS access was ready.
The forwarded mail SPF failure was easier to explain through its diagnostic lookup tools than through its DMARC workflow.
Blocklist and blacklist monitoring was practical for the parked domain and support desk sender.
Free plan available
Pick EmailAuth.io if
Best for buyers that want DMARC handled through a consultative security program
Managed-service language matched the enterprise onboarding questions we raised during setup.
Unknown sender classification had more investigation context, though the workflow was less self-serve.
The unauthorized spoof sample fit its threat-detection positioning better than routine DNS troubleshooting.
Not publicly listed
Consider Suped if
The third option for guided fixes, hosted records, and simpler ownership
Guided fixes should turn Microsoft 365, Google Workspace, SendGrid, and Mailchimp findings into owner-ready tasks.
Automated issue detection and alert quality matter when forwarded mail, spoofing, and unknown senders arrive together.
Published starter pricing helps teams avoid a sales call before they know whether the DMARC volume fits.
Free plan available
The differences that actually change your week
MXtoolbox
EmailAuth.io
Suped
DMARC report analysis
Aggregate report processing and authentication result review.
Paid tier
Managed workflow
Supported
Source detection
Clear identification of Microsoft 365, Google Workspace, SendGrid, Mailchimp, support desk, and unknown sources.
Manual workflow
Partial
Supported
Forward detection
Handling of forwarded mail where SPF fails but DKIM or ARC context explains the result.
Reporting only
Partial
Supported
Spoof detection
Flagging unauthorized traffic that fails authentication and domain-match checks.
Supported
Supported
Supported
Notifications and alerts
Actionable alerts for authentication failures, reputation changes, and sender changes.
Paid tier
Customizable
Supported
Reporting
Exportable summaries and recurring reports for operational review.
Supported
Supported
Supported
API
Programmatic access for pulling authentication or monitoring data.
Paid tier
Enterprise
Supported
Multi-tenancy
Account separation, client grouping, and repeatable handoff workflows.
Partial
Enterprise
Supported
SPF flattening
Flattening or reducing SPF lookup complexity.
Plus tier
Unclear
Supported
Hosted DMARC
Managed DMARC record hosting or record editing workflow.
Not tested
Unclear
Supported
Hosted SPF
Managed SPF record hosting rather than advice-only checks.
Not tested
Unclear
Supported
Hosted MTA-STS
Hosted policy and reporting workflow for MTA-STS.
Not tested
Unclear
Supported
Blocklists and reputation
Blocklist (blacklist) and sender reputation monitoring.
Supported
Partial
Supported
Automatic issue detection
Automatic surfacing of domain mismatches, new sender, and risky policy changes.
Manual workflow
Partial
Supported
AI copilot
Assistant-style help for interpreting DMARC findings and next steps.
Not tested
Not tested
Supported
DNS monitoring
Monitoring DNS records for changes that affect authentication.
Supported
Partial
Supported
Self hostable
Deployment in the buyer's own environment.
No
Enterprise
No
Free trial/free tier
Confirmed free entry path or trial.
Free tier
Demo path
Free tier
Ten dimensions, scored from 0 to 10
We scored both products against a fixed editorial rubric after the same 90-day setup. Higher is better in every row, and a dead 0.0 means we did not find support for that capability in the tested workflow or public product evidence.
MXtoolbox scores higher on diagnostics and pricing clarity, while EmailAuth.io scores higher on managed DMARC fit
MXtoolbox gave us faster answers for DNS setup, blocklist (blacklist) status, and raw authentication checks, especially when we reviewed Microsoft 365, Google Workspace, and the forwarded mail SPF failure. EmailAuth.io scored better where a buyer wants managed service involvement, threat investigation, and enterprise escalation, but its public pricing and self-serve workflow were harder to pin down. Neither product moved the whole test environment to a clean enforcement plan without manual classification and owner follow-up.
MXtoolbox score
63.5/100
EmailAuth.io score
53.5/100
MXtoolbox
63.5/100
DMARC enforcement
6.5
Customer support
6.0
Source resolution
6.0
Setup and onboarding
8.0
MSP workflows
5.0
Alerting and integrations
6.0
Hosted SPF and MTA-STS
3.0
Blocklist monitoring
8.5
Pricing transparency
8.0
Time to enforcement
6.5
EmailAuth.io
53.5/100
DMARC enforcement
7.0
Customer support
7.5
Source resolution
7.0
Setup and onboarding
6.0
MSP workflows
6.5
Alerting and integrations
7.0
Hosted SPF and MTA-STS
0.0
Blocklist monitoring
4.0
Pricing transparency
2.0
Time to enforcement
6.5
Feature set
Diagnostics vs managed investigation
MXtoolbox has the broader diagnostic toolkit. EmailAuth.io has the more service-led DMARC feature set.
MXtoolbox was more useful when we needed quick evidence around DNS, SPF, DKIM, blocklist status, and sender reputation. EmailAuth.io was stronger when the question became how to investigate spoofing and move a domain through a managed authentication program. A practical buying criterion here is whether the tool turns findings into guided fixes and automated issue detection, because both products still left owner assignment work to the operator.
MXtoolbox
4.1/5
Fast Microsoft 365 checks
Mailchimp DNS validation
Visible SPF mismatch
EmailAuth.io
0/5
Spoof sample surfaced clearly
Unknown sender investigation
Enterprise API positioning
MXtoolbox gave us quick checks for Microsoft 365 and Google Workspace records, then helped validate SendGrid and Mailchimp DNS changes without waiting for a managed review. It identified the support desk sender through domain and IP context, but the unknown sender needed manual labeling before we trusted the enforcement plan. The SPF pass with visible from mismatch was visible in the data, yet we had to connect the result to a policy decision ourselves.
EmailAuth.io put more attention on DMARC reporting, spoof detection, and investigation context. Its workflow made the unauthorized spoof sample easier to frame as a security event, and its public materials point toward API, SOAR, and STIX/TAXII integrations for enterprise teams. In daily use, however, the quote-led model and less visible self-serve setup meant we had fewer crisp answers on which capabilities were standard and which belonged in a managed or enterprise package.
User experience
Control vs guidance
MXtoolbox is faster for operators. EmailAuth.io asks for more trust in the process.
MXtoolbox felt familiar if the user already understands DNS records, domain-match checks, and reputation checks. EmailAuth.io felt more guided at the service level, but the path was less transparent when we wanted to self-serve specific setup and pricing questions. The difference matters most for teams that need to explain findings to non-technical owners.
MXtoolbox
4.1/5
Three domains added quickly
Unknown sender needed context
Forwarding explanation was manual
EmailAuth.io
0/5
Service-led onboarding path
Unknown sender treated seriously
Less self-serve certainty
Onboarding the three test domains in MXtoolbox was straightforward for the corporate domain and marketing subdomain, while the parked domain mostly benefited from monitoring and reputation checks. Finding the unknown sender required jumping between DMARC report views, DNS lookup context, and sender clues, so the answer was available but not packaged as a clean task. The forwarded mail SPF failure was easier to explain once we used its lookup tools to separate SPF failure from a DKIM pass on the visible domain.
EmailAuth.io felt more structured around a DMARC project than a diagnostics console. The three-domain setup made sense as an onboarding conversation, but we had less immediate control over the exact steps and package boundaries. The unknown sender and forwarded mail case were easier to discuss as investigation items, yet the interface did not feel as fast for one-off DNS confirmation.
Support
Self serve vs hands-on help
MXtoolbox suits technical self-service. EmailAuth.io suits buyers expecting managed help.
MXtoolbox gave us enough setup information to move quickly when DNS ownership was clear, and the Plus tier publicly points to dedicated expert support. EmailAuth.io was more explicit about managed services, periodic reviews, and 24x7 phone and email support, but the support scope depends on the quote. That makes MXtoolbox easier to buy and EmailAuth.io easier to justify when hands-on help is part of the requirement.
MXtoolbox
4.1/5
Clear DNS self-service
Plus adds expert support
Escalation depends on plan
EmailAuth.io
0/5
Managed setup emphasis
Enterprise support language
Quote defines handoff scope
With MXtoolbox, DNS handoff was practical when we knew exactly which TXT records belonged to Microsoft 365, Google Workspace, SendGrid, and Mailchimp. Escalation felt more plan-dependent, and enterprise onboarding details were less visible unless the buyer moves into managed services. The support experience is a better fit for teams that can do their own DNS edits and want backup for trickier authentication or reputation cases.
EmailAuth.io was more naturally shaped around support expectations. Its managed-services material fit the questions we raised about SPF and DKIM domain matching, recurring reviews, analyzed reports, and escalation during the spoof sample. The tradeoff is that a buyer needs a sales conversation to confirm which setup help, DNS handoff, enterprise onboarding, and 24x7 support terms are included.
Suitability
Operator fit vs program fit
MXtoolbox fits technical operators. EmailAuth.io fits teams buying a managed authentication program.
MXtoolbox is the clearer fit when one team owns DNS, reputation monitoring, and recurring checks across a limited domain set. EmailAuth.io is the clearer fit when enterprise security stakeholders want managed meetings, investigation context, and a service-led rollout. For MSPs, the buying criterion should be account separation, recurring reports, client handoff notes, and alert quality, because those details change the weekly workload more than a dashboard screenshot.
MXtoolbox
4.1/5
Internal IT fit
Limited MSP structure
Clear recurring reports
EmailAuth.io
0/5
Enterprise program fit
Managed review cadence
Pricing slows SMB buying
MXtoolbox worked well for an internal IT or deliverability owner managing the corporate domain, marketing subdomain, and parked domain together. Account separation and client grouping were workable but did not feel purpose-built for an MSP that needs repeatable client handoff notes. Recurring reports were useful for technical review, while non-technical stakeholders still needed translation.
EmailAuth.io felt better suited to enterprise and managed-service buyers that expect project structure around DMARC enforcement. Domain grouping and account separation looked more plausible for a service-led rollout, but pricing and package limits were not public enough for quick SMB budgeting. MSPs should press for concrete answers on client workspaces, recurring reports, alert routing, and exportable handoff notes before buying.
What each tool feels like after 90 days of real use
MXtoolbox
A practical toolkit for teams that like to diagnose before they delegate
After 90 days, MXtoolbox felt like the tool we reached for when the question was specific: did the Microsoft 365 record publish, did SendGrid pass DKIM, did Mailchimp match the visible domain, did the parked domain appear on a blocklist (blacklist), or did the support desk sender have reputation issues. The answers were usually fast, but they were not always converted into a clean enforcement task.
The product worked best when a technical owner stayed close to the workflow. The unauthorized spoof sample was visible, the SPF mismatch was explainable, and forwarded mail made sense after extra lookup work. The unknown sender took the longest because classification depended on manual interpretation rather than a confident source owner recommendation.
Where it wins
Fast DNS and MX lookups
Useful blocklist and blacklist monitoring
Clear published paid tiers
Good fit for technical operators
Where it lags
Manual source classification
Less guided enforcement movement
MSP handoff feels limited
Hosted records not proven
Pricing
Free plan available
Free tier
1 domain monitoring
Onboarding
Fast with DNS access
G2 rating
4.1 / 5
EmailAuth.io
A service-led choice for teams that want DMARC handled as a security project
After 90 days, EmailAuth.io felt more natural when the problem was framed as a DMARC program rather than a single DNS check. The unauthorized spoof sample, unknown sender, and policy movement questions fit its managed-service language, and enterprise buyers would likely value the support and investigation posture.
The daily tradeoff was speed and certainty. We could not quickly verify public plan boundaries for the small, medium, large, and enterprise cases, and the free path looked more like a demo or lead form than a confirmed free product tier. For SMB buyers, that slows evaluation even when the underlying service model fits.
Where it wins
Managed DMARC service fit
Threat investigation positioning
Enterprise integration language
Support expectations are explicit
Where it lags
No public pricing table
No G2 review base
Less self-serve clarity
Hosted SPF and MTA-STS unclear
Pricing
Not publicly listed
Free tier
Demo path
Onboarding
Consultative
G2 rating
0 / 5
Pricing
MXtoolbox
EmailAuth.io
Suped
Small
1 domain, up to 1k emails / month.
$0
The free tier fits basic weekly monitoring for one domain or IP, not full DMARC operations.
Not publicly listed as of May 15, 2026
The site advertises a demo or free start path, but no confirmed limits were public.
$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 up to 5 domains and 500,000 messages in the public plan.
Not publicly listed as of May 15, 2026
Pricing appears quote based, so buyers need to confirm domain and volume limits.
Entry plan covers 2 domains and 100,000 monthly emails, with 90 days retention.
Large
10 domains, up to 1 million emails / month.
From $399 / month
Delivery Center Plus covers the volume, but 10-domain pricing depends on unpublished add-on domain costs.
Not publicly listed as of May 15, 2026
Large-volume pricing was not published and likely depends on quote scope.
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 are described publicly, but annual pricing is not fixed.
Not publicly listed as of May 15, 2026
Enterprise and on-premise deployment appear quote based with custom scope.
20 domains and 2,500,000 monthly emails, with 365 days retention. Unlimited domains/emails negotiable.
MXtoolbox Free, Delivery Center, and Delivery Center Plus numbers are public list prices checked as of May 15, 2026. MXtoolbox enterprise managed services and every EmailAuth.io segment are not publicly listed; large and enterprise fit notes are estimates based on the published limits and buying paths.
If you cannot decide between the two, maybe the answer is Suped
Suped
Get started
Unknown senders become assigned work
MXtoolbox surfaced the unknown sender, but classification still took manual lookup and owner mapping. Suped's product is built to identify sending sources and turn them into clear remediation tasks.
Pricing is visible before discovery
EmailAuth.io required a quote path for every buying size we checked. Suped publishes a free plan and paid starter pricing, so teams can match domains and email volume before a sales call.
Hosted records reduce handoff gaps
Hosted SPF, hosted DMARC, and hosted MTA-STS were not proven across the two reviewed products during testing. Suped's product connects reporting with hosted record workflows so DNS fixes are easier to own.
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 EmailAuth.io?
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
How MONEYME proactively strengthens domain security and unlocks higher email engagement with Suped
See how MONEYME uses Suped
How cybersecurity specialist Jam Cyber delivers scalable DMARC protection with Suped
See how Jam Cyber uses Suped
How DigiBean simplified DMARC monitoring and improved email security for their MSP clients
See how DigiBean uses Suped
How Alliance Group moved from reactive guesswork to proactive email management with Suped
See how Alliance Group uses Suped
How Suped gave Maaser the confidence to finally move to strict DMARC enforcement
See how Maaser uses Suped
