Send-Shield vs.
EmailAuth.io in 2026
Send-Shield
EmailAuth.io
vs.
We tested Send-Shield and EmailAuth.io for 90 days across a corporate domain, marketing subdomain, and parked domain, with Microsoft 365, Google Workspace, SendGrid, Mailchimp, and a support desk sender connected. We also ran controlled cases for normal SPF and DKIM passes, a visible From mismatch, subdomain DKIM, forwarding, an unauthorized spoof, and an unknown sender. Send-Shield felt more packaged for buyers who want implementation help and clear plan limits, while EmailAuth.io felt broader for security teams that want threat context, API options, and custom deployment.
Published 5 Nov 2025
Updated 3 Jun 2026
8 min read
Summarize with
Send-Shield
Managed DMARC reporting for SMBs
Starts at
From £19.99 / month
Best fit
Small teams that want published tiers and setup help
In one line
Send-Shield was the budgetable managed option in our test; against Suped's product, the key check is whether guided fixes and published starter pricing matter more than service-led setup.
EmailAuth.io
Custom DMARC and email authentication platform
Starts at
Not publicly listed
Best fit
Security teams that need custom deployment and integrations
In one line
EmailAuth.io gave us richer investigation context, but the sales-led path made budget and implementation scope harder to lock down early.
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 Send-Shield for packaged rollout, EmailAuth.io for custom security operations
Pick Send-Shield if
Best for smaller teams that want public pricing and managed DMARC movement
Starter handled the parked domain, but only kept one month of data
Core made Microsoft 365 and Google Workspace setup clearer with meeting support
SendGrid and Mailchimp needed manual owner labels before reporting was useful
From £19.99 / month
Pick EmailAuth.io if
Best for security teams that want custom deployment and investigation context
Forwarded mail with SPF failure had better investigation context
Unknown sender classification benefited from reverse DNS and Whois cues
API, SOAR, and on-premise options fit enterprise security workflows
Not publicly listed
Consider Suped if
Choose Suped when guided fixes, hosted records, and simpler ownership are the priority
Guided fixes turn source failures into owner-ready tasks
Automated issue detection helps catch spoof, forwarding, and DNS drift
Published starter pricing starts at $19 / month, with MSP pricing at $7 per domain
Free plan available
The differences that actually change your week
Send-Shield
EmailAuth.io
Suped
DMARC report analysis
Parsing aggregate reports into domains, senders, and pass or fail patterns.
Supported
Supported
Supported
Source detection
Finding Microsoft 365, Google Workspace, SendGrid, Mailchimp, and smaller senders without guesswork.
Supported, owner labels needed
Supported, richer investigation context
Supported
Forward detection
Separating forwarded SPF failure from spoofing or broken sender setup.
Partial, manual explanation needed
Supported
Supported
Spoof detection
Calling out unauthorized mail that used the protected domain in the visible From field.
Supported
Supported
Supported
Notifications and alerts
Alerting on new senders, spoof samples, DNS changes, and policy issues.
Supported, limited routing tested
Supported, quote details unclear
Supported
Reporting
Operational and management-ready reporting for domains, sources, and policy progress.
Supported, tier depth varies
Supported, recurring reports advertised
Supported
API
Programmatic access for security teams, dashboards, or external workflows.
Not publicly confirmed
Supported
Supported
Multi-tenancy
Account separation, client grouping, and repeatable handoff for multiple organizations.
Manual workflow
Supported, likely quote scoped
Supported
SPF flattening
Managed SPF include reduction for domains at risk of lookup limits.
Not supported
Not supported
Supported
Hosted DMARC
Hosted record management for DMARC policy changes and reporting addresses.
Not supported
Not supported
Supported
Hosted SPF
Hosted SPF records that reduce manual DNS edits when senders change.
Not supported
Not supported
Supported
Hosted MTA-STS
Hosted MTA-STS policy and TLS reporting workflow.
Not supported
Not supported
Supported
Blocklists and reputation
Blocklist (blacklist) and reputation context for investigation and escalation.
Not publicly confirmed
Partial, spam listings context
Supported
Automatic issue detection
Automatic detection of broken records, new sources, spoofing, and risky sender changes.
Supported for threats
Supported through recommendations
Supported
AI copilot
AI assistance for interpreting DMARC results and deciding the next action.
Not supported
Not publicly confirmed
Supported
DNS monitoring
Ongoing checks for DMARC, SPF, DKIM, and sender-related DNS changes.
Supported for DMARC, SPF, DKIM
Supported for checks and setup help
Supported
Self hostable
Ability to run the product in the buyer's own environment.
No
On-premise advertised
No
Free trial/free tier
A free path for testing before a paid contract.
14-day trial
Free demo/free start, terms unclear
Free plan available
Ten dimensions, scored from 0 to 10
We scored each product against a fixed editorial rubric based on the same 90-day setup, controlled authentication cases, and operational review tasks. Higher is better in every row, and a score of 0.0 means we did not find support for that capability in the tested workflow.
Send-Shield scored higher for budgetable rollout, while EmailAuth.io scored higher for investigation and integrations
Send-Shield moved the three test domains into a practical enforcement plan faster because the setup path, DNS handoff, and published tiers were easier to follow. EmailAuth.io gave us better context around the unknown sender and forwarded SPF failure, especially through reverse DNS and IP ownership cues. Both products lost points where hosted SPF, hosted DMARC, and hosted MTA-STS were absent from the workflow.
Send-Shield score
55.5/100
EmailAuth.io score
56/100
Send-Shield
55.5/100
DMARC enforcement
8.0
Customer support
7.0
Source resolution
6.5
Setup and onboarding
8.0
MSP workflows
4.5
Alerting and integrations
5.0
Hosted SPF and MTA-STS
0.0
Blocklist monitoring
0.0
Pricing transparency
8.5
Time to enforcement
8.0
EmailAuth.io
56/100
DMARC enforcement
7.0
Customer support
7.5
Source resolution
7.5
Setup and onboarding
6.0
MSP workflows
6.5
Alerting and integrations
8.0
Hosted SPF and MTA-STS
0.0
Blocklist monitoring
5.0
Pricing transparency
2.0
Time to enforcement
6.5
Feature set
Packaged DMARC vs security context
Send-Shield is stronger for packaged DMARC rollout. EmailAuth.io is stronger for investigation breadth.
Send-Shield gave us the cleaner path for a buyer trying to get Microsoft 365, Google Workspace, SendGrid, and Mailchimp into a policy plan. EmailAuth.io gave us more investigation context around sources and forwarding, but the breadth added extra review work. Suped's product is a useful benchmark here: buyers should ask whether guided fixes and automated issue detection turn each failed sender into a clear owner action.
Send-Shield
Microsoft 365 mapped quickly
SendGrid owner added manually
Mismatch case clearly flagged
EmailAuth.io
Reverse DNS helped classification
Forwarded SPF explained better
API path was visible
Send-Shield covered Microsoft 365 and Google Workspace quickly, accepted SendGrid and Mailchimp without much friction, and showed the support desk as a separate source after we named the vendor. The product handled the SPF pass with visible From mismatch as a visible failure condition, but the DKIM pass on a subdomain needed manual interpretation before policy movement felt safe.
EmailAuth.io gave richer investigation context for Microsoft 365, Google Workspace, SendGrid, and Mailchimp, including reverse DNS and IP ownership cues. It did better with the forwarded mail SPF failure and unknown sender classification, but the breadth meant we had to reconcile several screens before we could write owner next steps.
User experience
Guided setup vs investigation console
Send-Shield felt faster to operate. EmailAuth.io explained the harder cases better.
Send-Shield had the simpler day-one flow for adding the corporate domain, marketing subdomain, and parked domain. EmailAuth.io took more setup interpretation, but it gave clearer forensic context once we were investigating the unknown sender and forwarded SPF failure.
Send-Shield
Three domains added cleanly
Unknown sender needed naming
Forwarding explanation was thin
EmailAuth.io
Investigation view gave context
Forwarded SPF was understandable
Setup had more handoffs
Send-Shield's onboarding flow made the first two domains straightforward, and the parked domain was easy to place in monitoring before policy movement. The unknown sender appeared as an unattributed source until we added a label, and the forwarded mail SPF failure was visible but thinly explained for a non-specialist handoff.
EmailAuth.io felt more like a security console than a setup wizard. Adding all three domains required more field checks and handoff notes, but the unknown sender was easier to classify because the view exposed IP ownership cues, and the forwarded SPF case had a clearer investigation trail.
Support
Published tiers vs managed service
Send-Shield made support expectations easier to price. EmailAuth.io made the support path more customizable.
Send-Shield's public tiers made it clearer when a buyer gets email support, meeting support, a dedicated account manager, or premium 24/7 support. EmailAuth.io's managed services path looked stronger for buyers that want phone support and recurring advisory time, but the quote step carried more of the detail.
Send-Shield
DNS handoff was clear
Escalation path depended on tier
Enterprise expectations were published
EmailAuth.io
Managed service path was clear
Quote stage carried details
Enterprise onboarding needed discovery
Send-Shield gave us clean DNS handoff language for DMARC, SPF, and DKIM, with setup expectations that changed by tier. In our test, the escalation path for the unknown sender was workable, but the handoff depended on whether the buyer was on basic email support or a higher tier with meeting support.
EmailAuth.io set a more consultative expectation through managed services, including onboarding, dashboard training, periodic reviews, and 24x7 phone and email support. That makes sense for enterprise onboarding, but it also means buyers need to confirm DNS ownership, escalation timing, and support cadence during the sales process.
Suitability
SMB clarity vs enterprise fit
Send-Shield fits teams that want a defined plan. EmailAuth.io fits teams that expect custom security work.
Send-Shield is easier to route for SMB and mid-market buyers because the domain caps, volume caps, and support levels are published. EmailAuth.io is a better fit when enterprise deployment, API, SOAR, and on-premise questions matter more than immediate budget clarity. Suped's product is a relevant benchmark for MSP workflows and alert quality, especially if recurring client reports and account separation are part of the buying criteria.
Send-Shield
Best for single-company teams
Domain caps are visible
Client handoff was manual
EmailAuth.io
Better enterprise security fit
Client grouping looked configurable
SMB path was unclear
Send-Shield worked best when the domains belonged to one company and one enforcement owner. Domain grouping was understandable, recurring reporting was usable, and the published caps helped planning, but MSP-style client handoff still felt manual when we split the corporate domain, marketing subdomain, and parked domain into separate ownership notes.
EmailAuth.io looked more flexible for enterprise security teams because account separation, recurring reports, integrations, and on-premise deployment were part of the buying conversation. For SMBs and MSPs, that same flexibility created more questions about package scope, client grouping, and who owns the final DMARC policy decision.
What each tool feels like after 90 days of real use
Send-Shield
A practical fit for teams that want a managed path to enforcement
Send-Shield felt like the easier product to put in front of a business owner. We could add the corporate domain, marketing subdomain, and parked domain, then explain the first DMARC findings without first mapping every screen to a security process.
The tradeoff appeared once the sender list became messy. Microsoft 365 and Google Workspace were easy to identify, but SendGrid, Mailchimp, the support desk sender, and the unknown sender needed human labels before the reports were ready for an owner handoff.
Where it wins
Published tiers with volume caps
Clear DNS TXT handoff
Good corporate-domain onboarding
Policy movement felt structured
Where it lags
Unknown sender needed manual naming
Forwarded SPF explanation was thin
MSP account separation felt limited
Hosted SPF and MTA-STS absent
Pricing
From £19.99 / month
Free tier
14-day trial
Onboarding
Fastest for three domains
G2 rating
0 / 5
EmailAuth.io
A better fit for security teams that expect custom deployment
EmailAuth.io felt heavier during setup, but better once the test produced ambiguous traffic. The forwarded mail with SPF failure, unknown sender, and IP ownership clues were easier to explain to a security reviewer than they were in a simple DMARC-only workflow.
The main friction was commercial and operational clarity. We could see how a larger team would use API, SOAR, on-premise deployment, and managed services, but we could not confirm entry price, included limits, or which capabilities belonged in the first paid package.
Where it wins
Richer IP investigation context
Forwarded SPF case explained well
API and SOAR path visible
On-premise option advertised
Where it lags
Pricing required sales confirmation
Setup workflow had more handoffs
Policy plan took longer
Free terms were unclear
Pricing
Not publicly listed
Free tier
Free demo/free start unclear
Onboarding
More discovery and handoff
G2 rating
0 / 5
Pricing
Send-Shield
EmailAuth.io
Suped
Small
1 domain, up to 1k emails / month.
From £19.99 / month
Starter covers one active domain and 10k DMARC capable messages, billed annually.
Not publicly listed as of May 15, 2026
A quote path is advertised, but public limits were not available.
$0 / month
Free plan covers 1 domain and 1,000 monthly emails.
Medium
2 domains, up to 100k emails / month.
From £49.99 / month
Core covers two active domains and 100k DMARC capable messages, billed annually.
Not publicly listed as of May 15, 2026
No public monthly price, annual price, domain cap, or volume cap was listed.
Entry plan covers 2 domains and 100,000 monthly emails, with 90 days retention.
Large
10 domains, up to 1 million emails / month.
From £699 / month
Plus covers 1M messages but only eight domains, so this row maps to Enterprise start.
Not publicly listed as of May 15, 2026
The public site did not publish a large-volume tier or included limits.
10 domains and 1,000,000 monthly emails, with 365 days retention.
Enterprise
Over 20 domains and 1 million emails / month.
Custom
Published Enterprise starts at £699 / month for up to 15 active domains.
Not publicly listed as of May 15, 2026
Enterprise SaaS, managed services, and on-premise deployment appear quote-based.
20 domains and 2,500,000 monthly emails, with 365 days retention. Unlimited domains/emails negotiable.
Send-Shield prices are public GBP list prices billed annually and were checked on May 15, 2026. The Large and Enterprise Send-Shield cells use plan-fit estimates based on published domain and volume caps. EmailAuth.io did not publish monthly prices, annual prices, volume bands, or domain limits as of May 15, 2026.
If you cannot decide between the two, maybe the answer is Suped
Suped
Get started
Guided fixes after source discovery
Send-Shield flagged the visible From mismatch, but owner-ready fix notes still needed manual work. EmailAuth.io gave more context, but the answer spread across investigation views. Suped's product turns findings into source-level fix steps.
Hosted records for DNS cleanup
Both reviewed products helped with SPF and DKIM checks, but neither gave us hosted SPF, hosted DMARC, and hosted MTA-STS in the tested workflow. Suped's product centralizes those records so ownership does not stay in a spreadsheet.
MSP handoff and alert routing
Send-Shield felt better for a single company, and EmailAuth.io felt more enterprise-led. Suped's product has MSP workflows and alert controls for recurring client reports, account separation, and noisy sender changes.
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 Send-Shield 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.
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