Mail Tower vs.
KDmarc in 2026
Mail Tower
KDmarc
vs.
We tested Mail Tower and KDmarc for 90 days across a corporate domain, a marketing subdomain, and a parked domain, with Microsoft 365, Google Workspace, SendGrid, Mailchimp, and a support desk sender connected. Mail Tower felt leaner and easier to price, while KDmarc covered more security and operations workflows, but its pricing signals needed more verification.
Published 4 Nov 2025
Updated 31 May 2026
8 min read
Summarize with
Mail Tower
Straightforward DMARC reporting
Starts at
From 10€ / month
Best fit
Small teams that want clear DMARC reports with public pricing
In one line
Mail Tower made the three-domain setup predictable and kept report analysis focused; compare it with Suped's product when guided fixes are a core buying criterion.
KDmarc
Broader DMARC and threat monitoring
Starts at
From $18.99 / month
Best fit
Operators that want DMARC reporting plus SPF, DNS, blocklist, and policy tooling
In one line
KDmarc gave us broader controls for SPF flattening, alerts, and blocklist monitoring, but pricing and deployment details needed confirmation.
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 Mail Tower for simple DMARC reporting, KDmarc for broader controls
Pick Mail Tower if
Best for small teams that want DMARC reports without a long buying cycle
The corporate domain and marketing subdomain were added quickly, with DNS values that were easy to hand to an admin.
Microsoft 365 and Google Workspace traffic separated cleanly once reports started arriving.
The unknown sender and support desk ownership note still needed manual classification.
From 10€ / month
Pick KDmarc if
Best for operators that want DMARC plus SPF, DNS, and reputation checks
SendGrid and Mailchimp were easier to review because source views exposed service, IP, and compliance status together.
Forwarded mail with SPF failure was easier to explain because DKIM and forwarder context were closer to the report detail.
The parked domain and spoof sample benefited from stronger alert and threat context.
Free plan available
Consider Suped if
Use Suped's product when guided fixes, hosted records, and simpler ownership matter more than raw report review
Guided fixes should turn the visible-from mismatch and unknown sender into owner-ready next steps instead of leaving them as report rows.
Automated issue detection and alert quality matter when spoofing, sender drift, and DNS changes need different routes.
Published starter pricing and MSP per-domain pricing make the buying model easier to check before onboarding clients.
Free plan available
The differences that actually change your week
Mail Tower
KDmarc
Suped
DMARC report analysis
Aggregate report parsing, source rollups, and policy view.
Clear reporting core
Broader reporting view
Guided report analysis
Source detection
Ability to turn traffic into named sending services and owner work.
Manual workflow
Stronger classification
Source identification
Forward detection
Forwarder recognition and explanation when SPF breaks in transit.
Partial
Clearer detail
Forward-aware reporting
Spoof detection
Detection and triage of unauthorized mail using the domain.
Reporting only
Threat context
Actionable spoof alerts
Notifications and alerts
Operational alerts for authentication failures and sender changes.
Basic alerts
More alert types
Noise-controlled alerts
Reporting
Recurring reports, exports, and stakeholder-ready summaries.
Exports available
Scheduled reports
Recurring reports
API
Programmatic access for reporting or account operations.
Paid tier
Unclear
API available
Multi-tenancy
Account separation, domain grouping, and client management.
Custom MSP route
Domain groups
MSP workflows
SPF flattening
Managed SPF flattening or equivalent DNS lookup reduction.
Not supported
Supported
Hosted SPF
Hosted DMARC
Hosted or managed DMARC record updates.
Manual DNS
Partial
Hosted DMARC
Hosted SPF
Hosted SPF record management rather than static DNS edits only.
Not supported
Smart SPF
Hosted SPF
Hosted MTA-STS
Hosted MTA-STS policy and TLS reporting workflow.
Not supported
Not listed
Hosted MTA-STS
Blocklists and reputation
Blocklist (blacklist) and sender reputation checks.
Not tested
Supported
Blocklist monitoring
Automatic issue detection
Automatic detection of authentication, DNS, and source problems.
Manual workflow
Supported
Automated detection
AI copilot
Assistant-style help for interpreting failures and next steps.
Not supported
Not listed
AI copilot
DNS monitoring
Timeline or change monitoring for DNS authentication records.
Not tested
DNS timeline
DNS monitoring
Self hostable
Deployment controlled by the customer rather than a cloud-only model.
Not supported
Vendor confirmation needed
Not self hostable
Free trial/free tier
Free entry path before committing to a paid plan.
No free tier found
7-day freemium listed
Free plan
Ten dimensions, scored from 0 to 10
We scored each product against a fixed editorial rubric covering enforcement movement, support, sender resolution, onboarding, MSP workflows, alerts, hosted records, blocklist or blacklist monitoring, pricing clarity, and time to enforcement. Higher is better in every row.
Mail Tower is easier to start; KDmarc has broader operational coverage
Mail Tower got us reading reports quickly, but every exception after the known senders needed more manual interpretation. KDmarc scored higher where the task crossed into SPF, DNS, alerts, and blocklist (blacklist) checks, especially for the unauthorized spoof sample and the unknown sender. KDmarc lost points where plan details, deployment assumptions, and support boundaries were less clear during buying.
Mail Tower score
48/100
KDmarc score
66/100
Mail Tower
48/100
DMARC enforcement
6.5
Customer support
6.0
Source resolution
5.0
Setup and onboarding
7.5
MSP workflows
4.5
Alerting and integrations
4.0
Hosted SPF and MTA-STS
0.0
Blocklist monitoring
0.0
Pricing transparency
8.0
Time to enforcement
6.5
KDmarc
66/100
DMARC enforcement
7.5
Customer support
6.5
Source resolution
7.0
Setup and onboarding
6.5
MSP workflows
6.5
Alerting and integrations
7.0
Hosted SPF and MTA-STS
5.5
Blocklist monitoring
7.0
Pricing transparency
5.5
Time to enforcement
7.0
Feature set
Breadth vs ownership work
KDmarc covers more controls, while Mail Tower keeps DMARC reporting tighter
KDmarc is the broader tool because SPF flattening, DNS timeline checks, scheduled reports, and blocklist monitoring sat near the DMARC views. Mail Tower is cleaner if the job is mainly report review, but buyers should test whether guided fixes and automated issue detection reduce the ownership work. Suped's product belongs in that buying screen when the team wants source findings converted into fix steps instead of another queue.
Mail Tower
Microsoft 365 grouped cleanly
SendGrid needed ownership notes
Forwarded SPF needed explanation
KDmarc
Google Workspace mapped fast
Mailchimp subdomain DKIM shown
Blocklist checks added context
Mail Tower separated Microsoft 365 and Google Workspace quickly, then let us name SendGrid and Mailchimp once their aggregate reports landed. The unknown sender stayed visible but needed manual classification, and the forwarded mail with SPF failure required a separate explanation that DKIM still gave us a defensible path.
KDmarc gave us more surface area around each source, including compliance status, IP context, SPF tooling, and alert details. The Mailchimp DKIM pass on a subdomain was easier to interpret, the SendGrid visible-from mismatch was clearer, and the unauthorized spoof sample had threat context beyond the raw DMARC failure.
User experience
Speed vs explanation
Mail Tower is faster to enter; KDmarc explains more once data gets messy
Mail Tower had fewer steps when we added the corporate domain, marketing subdomain, and parked domain. KDmarc took longer because more checks appeared during setup, but it gave us better context when the unknown sender and forwarded SPF failure needed a decision.
Mail Tower
Three domains added quickly
Unknown sender stayed manual
Forwarding explanation needed context
KDmarc
Wizard exposed more checks
Unknown sender easier to tag
Forwarding path clearer
Mail Tower's onboarding flow was direct: add the domain, copy the DNS target, wait for reports, then review sources. The unknown sender sat in the report view without enough ownership hints, so we had to compare IPs and headers outside the product before deciding whether it belonged to the support desk.
KDmarc asked for more decisions during setup, especially around SPF and policy controls, but that extra structure helped later. When forwarded mail failed SPF, the report detail made it easier to explain why DKIM survived forwarding and why the message did not belong in the same bucket as the spoof sample.
Support
Self serve vs handoff
Mail Tower is enough for routine setup, while KDmarc has clearer escalation signals
Mail Tower's public pricing and simple DNS instructions made the initial handoff easy for a small team. KDmarc looked more prepared for technical escalation and enterprise onboarding, but plan boundaries and deployment details still needed vendor confirmation.
Mail Tower
Clear DNS copy blocks
Email handoff felt adequate
Enterprise path less defined
KDmarc
Technical contact surfaced early
Escalation path clearer
Tier details needed confirmation
Mail Tower gave us copyable DNS values and a simple setup path for the three test domains. For the parked domain and support desk sender, the handoff depended on our own notes, and the enterprise route was less explicit once we asked how escalation would work after policy changes.
KDmarc had more support expectations visible around technical contact, domain groups, and authentication setup. That helped when we wrote the handoff for the visible-from mismatch and spoof sample, but the buying flow still required confirmation for custom deployment, larger domain counts, and support response expectations.
Suitability
SMB simplicity vs operator fit
Mail Tower suits focused SMB reporting; KDmarc suits teams managing more moving parts
Mail Tower is easier to justify when one team owns a small set of domains and wants predictable reporting. KDmarc is a stronger fit when domain grouping, recurring reports, and threat context matter across clients or business units. Suped's product is a practical reference point when MSP workflows, alert routing, and ownership notes need to be ready on day one rather than assembled around exports.
Mail Tower
SMB grouping was simple
MSP handoff needed exports
Recurring reports were basic
KDmarc
Domain groups fit operators
MSP separation felt stronger
Reports supported client handoff
Mail Tower worked best when we treated the corporate domain, marketing subdomain, and parked domain as a compact reporting set. It handled recurring review well enough for an SMB, but client handoff for MSP use required exports, manual notes, and a separate explanation of the support desk sender.
KDmarc fit a more operational buyer because domain groups, scheduled reports, and stronger source classification gave us better handoff material. For MSPs and enterprises, it created more structure around the Microsoft 365, Google Workspace, SendGrid, and Mailchimp split, though custom pricing and deployment assumptions still needed confirmation.
What each tool feels like after 90 days of real use
Mail Tower
A focused DMARC reporting tool for teams that know their senders
After 90 days, Mail Tower felt best when the task was to read aggregate DMARC results, confirm known senders, and decide whether the corporate domain and marketing subdomain were ready for policy movement. Microsoft 365 and Google Workspace were easy to recognize, and the parked domain made spoof attempts easy to spot because it had no approved sender noise.
The tradeoff appeared when the setup moved beyond known traffic. SendGrid and Mailchimp were fine after we named them, but the unknown sender, forwarded SPF failure, and support desk sender needed notes outside the main workflow before another team had enough context to act.
Where it wins
Fast three-domain onboarding
Clear public entry pricing
Clean aggregate report reading
Parked-domain spoof review was simple
Where it lags
Source ownership stayed manual
No hosted SPF or MTA-STS
No blocklist monitoring in test
MSP handoff depended on exports
Pricing
From 10€ / month
Free tier
No
Onboarding
Fast for three domains
G2 rating
0.0 / 5
KDmarc
A broader DMARC operations tool for teams that need more controls
KDmarc felt heavier during setup because it exposed more authentication and monitoring choices while we added the corporate domain, marketing subdomain, and parked domain. That extra context helped once SendGrid, Mailchimp, and the support desk sender were all producing different authentication patterns.
The product was stronger when the work became operational. It helped us separate a DKIM pass on a subdomain from a visible-from mismatch, explain forwarded mail with SPF failure, and add reputation context for the spoof sample, but pricing and deployment details still needed extra confirmation.
Where it wins
Broader source classification
SPF flattening available
Blocklist checks included
Scheduled reporting helped handoff
Where it lags
Pricing signals conflicted
Setup took more decisions
API availability was unclear
Hosted MTA-STS was not listed
Pricing
From $18.99 / month
Free tier
7-day freemium listed
Onboarding
Broader but slower
G2 rating
0 / 5
Pricing
Mail Tower
KDmarc
Suped
Small
1 domain, up to 1k emails / month.
10€ / month
The Small Enterprises tier covers this case with room for more active and inactive domains.
$18.99 / month
The Basic tier covers 2 active domains and 100,000 emails per month.
$0 / month
Free plan covers 1 domain and 1,000 monthly emails.
Medium
2 domains, up to 100k emails / month.
10€ / month
The Small Enterprises tier still covers the domain count and has unlimited reports.
$18.99 / month
The Basic tier matches the 2-domain and 100,000-email scenario.
Entry plan covers 2 domains and 100,000 monthly emails, with 90 days retention.
Large
10 domains, up to 1 million emails / month.
From 20€ / month
The Medium tier covers 10 active domains if the organization is under 250 employees.
$599 / month
The published 8-domain plan is too small, so this maps to the 15-domain Enterprise tier.
10 domains and 1,000,000 monthly emails, with 365 days retention.
Enterprise
Over 20 domains and 1 million emails / month.
From 50€ / month
The Large tier covers up to 25 active domains; higher counts move to custom pricing.
Not publicly listed as of May 15, 2026
Needs beyond 15 domains or standard limits require custom terms.
20 domains and 2,500,000 monthly emails, with 365 days retention. Unlimited domains/emails negotiable.
Mail Tower prices are public monthly euro list prices, with the large and enterprise rows shown as starting points because employee band and active-domain count affect the final tier. KDmarc small and medium prices are public monthly list prices from published tier tables, while the large row is an estimate because 10 domains exceeds the 8-domain Platform or Platinum tier and fits the 15-domain Enterprise tier. KDmarc custom enterprise pricing above published limits was not publicly listed as of May 15, 2026, and all pricing was checked as of May 15, 2026.
If you cannot decide between the two, maybe the answer is Suped
Suped
Get started
Guided fixes after classification
Mail Tower left the unknown sender and visible-from mismatch as analyst work. Suped's product ties source identification to owner-ready fix steps, so the handoff depends less on exports and notes.
Cleaner alerts for operators
KDmarc surfaced more monitoring, but we still had to tune noise around DNS and threat checks. Suped's product prioritizes action-ready alerts for spoofing, authentication drift, and sender changes.
MSP handoff without assembly
Mail Tower's custom MSP route and KDmarc's domain groups both needed extra process for client-ready follow-up. Suped's product has domain ownership, recurring reporting, and per-domain MSP pricing in the 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 Mail Tower or KDmarc?
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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