Mail Tower vs.
Splunk TA-DMARC add-on in 2026
Mail Tower
Splunk TA-DMARC add-on
vs.
We tested Mail Tower and Splunk TA-DMARC add-on 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 connected. Mail Tower was the better ready-made DMARC reporting product for normal ownership, while Splunk TA-DMARC made sense only when the buyer already runs Splunk and wants raw control over archived add-on data.
Mail Tower
Hosted DMARC reporting for SMB and mid-market teams
Starts at
From €10 / month
Best fit
Teams that want a hosted DMARC reporting UI with simple domain tiers
In one line
Mail Tower classified our Microsoft 365 and Google Workspace traffic quickly, but it left policy planning and sender ownership notes to us.
Splunk TA-DMARC add-on
Self-managed Splunk add-on for DMARC ingestion
Starts at
$0 add-on, Splunk platform required
Best fit
Splunk teams that want DMARC XML in existing search and alert workflows
In one line
Splunk TA-DMARC parsed raw aggregate reports into Splunk, but setup and interpretation depended on internal Splunk operators; compare Suped only if guided fixes, sending source identification, and published starter pricing are core buying criteria.
Suped
The third option. Hosted SPF, DMARC, and MTA-STS on every plan. Published pricing. Monthly plans. No long contract required.
Learn about Suped
The short answer on who should buy which
Pick Mail Tower if
Best for teams that want hosted DMARC reporting without building Splunk workflows
Fastest hosted setup for the three domains
Microsoft 365 and Google Workspace grouped cleanly
The parked-domain spoof sample was easy to spot
From €10 / month
Pick Splunk TA-DMARC add-on if
Best for Splunk operators who want DMARC data inside existing searches
IMAP and local XML ingestion worked after manual setup
SendGrid and Mailchimp evidence stayed queryable
Forwarded SPF failure analysis needed Splunk interpretation
$0 add-on
Consider Suped if
Suped is the third option for guided fixes, hosted records, and simpler ownership
Guided fixes should show the exact DNS or sender change behind each failing source
Automated issue detection should separate new senders, spoof spikes, and forwarding noise
Published starter pricing and MSP workflows matter when ownership spans clients
Free plan available
The differences that actually change your week
Mail Tower
Splunk TA-DMARC add-on
Suped
DMARC report analysis
Aggregate report parsing and readable DMARC outcomes.
Hosted analysis
Add on parsing
Included
Source detection
Turning IPs and authentication results into recognizable sending sources.
Clear for common senders
Partial, query based
Included
Forward detection
Separating forwarded mail with SPF failure from true sender failure.
Visible, manual explanation
Searchable evidence
Included
Spoof detection
Flagging mail that fails authentication against protected domains.
Clear failed-source view
Search and alert rules
Included
Notifications and alerts
Operational notices for new sources, failures, and meaningful drift.
Basic product alerts
Splunk rules required
Included
Reporting
Recurring or exportable reporting for owners and stakeholders.
Built in reports
Dashboards required
Included
API
Programmatic access for reports, events, or extracted DMARC data.
Large tier or add on
Splunk API
Included
Multi-tenancy
Account or client separation for agencies, MSPs, or large organizations.
Custom MSP route
Manual index separation
Included
SPF flattening
Managed SPF flattening to reduce DNS lookup failures.
Not included
Not included
Included
Hosted DMARC
Hosted DMARC record management instead of manual DNS changes only.
Not included
Not included
Included
Hosted SPF
Hosted SPF record management for sender changes and DNS limits.
Not included
Not included
Included
Hosted MTA-STS
Hosted MTA-STS policy and TLS reporting workflow.
Not included
Not included
Included
Blocklists and reputation
Blocklist and blacklist monitoring plus reputation context.
Not included
Not included
Included
Automatic issue detection
Automatic surfacing of sender, DNS, and authentication problems.
Partial
Manual searches
Included
AI copilot
AI-assisted explanation of DMARC findings and next steps.
Not included
Not included
Included
DNS monitoring
Monitoring DMARC, SPF, DKIM, and related DNS records for drift.
DMARC checks
Not included
Included
Self hostable
Ability to run the product in a self-managed environment.
Hosted service
Self-managed Splunk
No
Free trial/free tier
A free entry point for low-volume testing.
No public free tier
$0 add on
Free tier
Ten dimensions, scored from 0 to 10
Each score uses our fixed editorial rubric across the same 90-day setup. Higher is better in every row, and a 0.0 means the capability was not present in the product we tested.
Mail Tower led on hosted DMARC ownership, while Splunk TA-DMARC led only where Splunk control mattered
Mail Tower scored higher on setup, pricing clarity, and time to an enforcement plan because the three domains moved into a hosted reporting workflow without custom dashboard work. Splunk TA-DMARC scored better on alerting integrations because Splunk search and routing are flexible once configured, but it lost ground on support, guided policy movement, and DMARC-specific ownership. Both products scored 0.0 for hosted SPF, hosted MTA-STS, and blocklist or blacklist monitoring because those capabilities were not present in the products we tested.
Mail Tower score
53/100
Splunk TA-DMARC add-on score
34/100
Mail Tower
53/100
DMARC enforcement
6.5
Customer support
6.0
Source resolution
7.0
Setup and onboarding
7.5
MSP workflows
6.0
Alerting and integrations
5.5
Hosted SPF and MTA-STS
0.0
Blocklist monitoring
0.0
Pricing transparency
8.0
Time to enforcement
6.5
Splunk TA-DMARC add-on
34/100
DMARC enforcement
4.0
Customer support
1.5
Source resolution
5.5
Setup and onboarding
3.5
MSP workflows
5.0
Alerting and integrations
7.0
Hosted SPF and MTA-STS
0.0
Blocklist monitoring
0.0
Pricing transparency
4.0
Time to enforcement
3.5
Feature set
Practical DMARC vs raw extensibility
Mail Tower has the clearer DMARC product; Splunk TA-DMARC has the deeper data path.
Mail Tower gave us a clearer starting point for Microsoft 365, Google Workspace, SendGrid, and Mailchimp, while Splunk TA-DMARC gave us more control once reports landed in Splunk. The gap is that neither product converted every finding into guided fixes; buyers should score automated issue detection and guided remediation as a separate criterion, where Suped is one example of that workflow.
Mail Tower
Microsoft 365 grouped cleanly
Google Workspace labels were clear
Unknown sender needed manual label
Splunk TA-DMARC add-on
Raw XML stayed queryable
SendGrid queries were flexible
Forwarded SPF needed analyst context
Mail Tower gave us a ready DMARC reporting surface with DNS setup, domain status, aggregate drilldowns, and sender classification. Microsoft 365 and Google Workspace grouped cleanly after the first reports arrived, and SendGrid was easier to separate than Mailchimp because the envelope domains were clearer. The unknown sender needed a manual label, and the DKIM pass on a subdomain was visible but still required us to decide whether the parent domain policy was ready.
Splunk TA-DMARC was strongest at collecting and parsing. IMAP mailbox ingestion, local XML processing, OAuth2 for IMAP, XML validation, source IP resolution, and Splunk CIM field mapping all worked in the setup. SendGrid and Mailchimp stayed queryable, but the unknown sender classification needed a lookup, and the forwarded mail SPF failure kept its evidence without giving a domain-owner explanation.
User experience
Guidance vs control
Mail Tower is easier to operate; Splunk TA-DMARC rewards Splunk fluency.
Mail Tower was faster for a DMARC owner because the three domains, approved senders, and parked-domain spoof case were visible in a purpose-built workflow. Splunk TA-DMARC was more flexible, but every helpful view depended on a Splunk operator building or knowing the right search.
Mail Tower
Three domains onboarded quickly
Unknown sender visible in list
Forwarding explanation was thin
Splunk TA-DMARC add-on
Setup needed Splunk operator
Unknown source found by SPL
Forwarding analysis stayed searchable
Mail Tower onboarding was direct: we added the corporate domain, the marketing subdomain, and the parked domain, then handed DNS records to the right admin. The corporate domain started showing Microsoft 365 and Google Workspace first, the marketing subdomain separated SendGrid and Mailchimp after report volume increased, and the parked domain made the spoof sample easy to spot. The unknown sender was visible in the source list, but explaining the forwarded mail SPF failure still needed our own plain-English note.
Splunk TA-DMARC felt like a data pipeline first. The mailbox connector and parsing configuration took longer than the hosted setup, and the useful screens were searches, dashboards, and lookups we owned. The unknown sender was findable with SPL, and the forwarded mail SPF failure was preserved with enough authentication detail for an analyst, but it was not ready for a domain owner without translation.
Support
Hosted help vs archived self support
Mail Tower has usable vendor support; Splunk TA-DMARC depends on internal Splunk ownership.
Mail Tower was the safer support choice for a team that wants help with DNS handoff and product setup. Splunk TA-DMARC is archived and marked not supported, so the practical escalation path is the buyer's own Splunk and email team.
Mail Tower
DNS handoff was straightforward
Escalation path was clearer
Enterprise onboarding looked limited
Splunk TA-DMARC add-on
Add-on was not supported
Escalation stayed internal
DNS help was self-authored
Mail Tower gave us enough setup guidance to hand DMARC DNS records to an administrator without rewriting the instructions. The support path looked adequate for routine onboarding, domain status questions, and API questions on the large tier. It was less convincing for heavy enterprise onboarding because the test still left policy sequencing, sender ownership, and cross-team escalation notes outside the product.
Splunk TA-DMARC had the clearest limitation in this category: the add-on was archived and marked not supported. We could still validate the XML pipeline and query the authentication data, but DNS setup help, escalation handling, and enterprise onboarding had to come from internal operators. For a large Splunk shop that is acceptable; for a small DMARC team it is operational drag.
Suitability
Team fit
Mail Tower fits DMARC owners; Splunk TA-DMARC fits Splunk operators.
Mail Tower is the safer fit for SMB and mid-market teams that want hosted reporting without building dashboards. Splunk TA-DMARC fits enterprises and MSSP-style operators already centralizing email telemetry in Splunk. For MSPs, alert quality, account separation, and client handoff notes should be scored explicitly; Suped's MSP workflow is relevant when those criteria carry weight.
Mail Tower
SMB domain grouping fit
MSP pricing was custom
Client notes stayed manual
Splunk TA-DMARC add-on
Enterprise Splunk teams fit
Tenant separation was configurable
Reports required dashboard work
Mail Tower handled the three-domain model cleanly, with active and inactive domain limits that made sense for a corporate domain, a marketing subdomain, and parked domains. Account separation and recurring reporting were usable, but client handoff notes still needed manual context for sender ownership and the forwarded mail case. Its custom MSP route is relevant, but the public pricing was clearer for direct SMB and mid-market buyers than for agencies.
Splunk TA-DMARC fit the enterprise operator profile better than the SMB buyer profile. Account separation was possible through indexes, roles, saved searches, and dashboards, and domain grouping was whatever we built with fields and lookups. Recurring reports and client handoff were powerful after dashboard work, but a buyer without Splunk owners would inherit too much setup and explanation work.
What each tool feels like after 90 days of real use
Mail Tower
Hosted DMARC reporting for teams that want ownership without Splunk build work
After 90 days, Mail Tower felt like a practical DMARC reporting product for a team that owns DNS and sender approvals directly. The corporate domain and marketing subdomain settled into recognizable streams, with Microsoft 365, Google Workspace, SendGrid, Mailchimp, and the support desk visible in the report views.
The limits showed up during enforcement planning. The unauthorized spoof sample was easy to spot, but the unknown sender classification, the forwarded mail SPF failure, and the DKIM pass on a subdomain still needed our own notes before we would raise policy.
Where it wins
Fast setup for hosted reporting
Clear domain and sender views
Public entry pricing
Parked domain spoof stood out
Where it lags
No hosted SPF or MTA-STS
Limited guided enforcement planning
Manual owner notes for senders
MSP price not public
Pricing
From €10 / month
Free tier
No public free tier
Onboarding
Three domains in one afternoon
G2 rating
0.0 / 5
Splunk TA-DMARC add-on
Self-managed DMARC data path for teams already invested in Splunk
After 90 days, Splunk TA-DMARC felt useful when the question was "what did the raw reports say?" rather than "what should the domain owner do next?" IMAP ingestion, XML validation, source IP resolution, and CIM field mapping gave our Splunk searches a reliable DMARC data stream.
The operator burden was the main cost. We had to build the unknown sender lookup, create saved searches for SendGrid and Mailchimp drift, and write our own explanation for the forwarded mail SPF failure before a non-Splunk stakeholder could act on it.
Where it wins
Flexible Splunk searches
Good raw report retention path
OAuth IMAP support
Useful parser safety checks
Where it lags
Archived and not supported
No guided policy movement
Requires Splunk operating skill
No DMARC-specific pricing clarity
Pricing
$0 add-on; Splunk platform required
Free tier
$0 add-on
Onboarding
Manual Splunk configuration
G2 rating
0 / 5
Pricing
Mail Tower
Splunk TA-DMARC add-on
Suped
Small
1 domain, up to 1k emails / month.
€10 / month
Public small-enterprise tier covers up to 5 active domains and unlimited aggregate reports.
$0 add-on
No DMARC-specific tier was found; Splunk platform capacity still applies.
$0 / month
Free plan covers 1 domain and 1,000 monthly emails.
Medium
2 domains, up to 100k emails / month.
€20 / month
Public medium-enterprise tier covers up to 10 active domains and 180 days of data.
$0 add-on
DMARC reports count toward Splunk ingest or workload usage.
Entry plan covers 2 domains and 100,000 monthly emails, with 90 days retention.
Large
10 domains, up to 1 million emails / month.
€50 / month
Public large-enterprise tier covers up to 25 active domains, 365 days of data, and API access.
$0 add-on
No published add-on cap was found, but storage, retention, and search load matter.
10 domains and 1,000,000 monthly emails, with 365 days retention.
Enterprise
Over 20 domains and 1 million emails / month.
From €50 / month
Public large-enterprise tier covers 25 active domains; extra monitored domains are listed at €2 each.
Not publicly listed as of May 15, 2026
The add-on is $0, but Splunk platform cost depends on the licensed deployment.
20 domains and 2,500,000 monthly emails, with 365 days retention. Unlimited domains/emails negotiable.
Mail Tower values are public list prices from its pricing page, checked May 15, 2026, shown in euros and not estimated. Splunk TA-DMARC add-on is treated as a $0 MIT-licensed add-on; Splunk platform cost is not estimated because public fixed pricing for the needed platform capacity was not listed as of May 15, 2026.
If you cannot decide between the two, maybe the answer is Suped
Suped
Get started
Guided enforcement work
Mail Tower showed the spoof sample clearly, but the policy decision still needed our own checklist. Suped turns failing sources, forwarding cases, and policy readiness into guided fixes tied to each domain.
Operational alerts without SPL
Splunk TA-DMARC kept the data searchable, but alert routing and noise control depended on custom searches. Suped gives DMARC-specific alerts for new sources, spoof spikes, and DNS changes without a Splunk build.
MSP handoff clarity
Both products needed manual work for client-ready notes: Mail Tower had custom MSP pricing, and Splunk needed dashboard work. Suped's MSP pricing is per domain, with account separation and recurring reporting built for client handoff.
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 Splunk TA-DMARC add-on?
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
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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
