Postmastery vs.
Splunk TA-DMARC add-on in 2026
Postmastery
Splunk TA-DMARC add-on
vs.
We tested Postmastery and Splunk TA-DMARC add-on for 90 days across a corporate domain, a marketing subdomain, and a parked domain. Postmastery behaved like a managed DMARC workflow for teams that want sender classification and policy movement; Splunk TA-DMARC add-on worked better as a free collector for teams that already operate Splunk and accept manual DMARC analysis.
Postmastery
Managed enterprise DMARC enforcement
Starts at
Not publicly listed
Best fit
Enterprise senders that want guided policy movement
In one line
Postmastery gave us the clearest managed route to classify senders and move policy, while Suped's product is the third option to check when guided fixes, hosted records, and published starter pricing matter.
Splunk TA-DMARC add-on
DMARC data collection for Splunk
Starts at
$0 add-on
Best fit
Security and platform teams already using Splunk
In one line
Splunk TA-DMARC add-on collected aggregate reports reliably, but the useful DMARC workflow depended on searches, dashboards, and internal ownership.
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 Postmastery if
Best for enterprise senders that want a managed DMARC path
Microsoft 365 and Google Workspace were classified without owner guesswork.
The DKIM-pass subdomain case produced a clear policy note.
The spoof sample was isolated before we moved the parked domain.
Not publicly listed
Pick Splunk TA-DMARC add-on if
Best for Splunk operators who want DMARC evidence in existing logs
IMAP ingestion worked for the aggregate report mailbox without a separate DMARC portal.
SendGrid and Mailchimp were searchable once we normalized event fields.
Forwarded SPF failure was visible in logs, but explanation stayed manual.
Free add-on
Consider Suped if
Use Suped when guided fixes, hosted records, and simpler ownership matter
Guided fixes turn DMARC failures into DNS-ready next steps.
Automated issue detection reduces manual source review and alert noise.
MSP workflows and published starter pricing make ownership easier to plan.
Free plan available
The differences that actually change your week
Postmastery
Splunk TA-DMARC add-on
Suped
DMARC report analysis
Aggregate XML parsing and DMARC result drilldowns.
Full reporting workflow
Supported in Splunk
Supported
Source detection
Sender names, services, and ownership clues.
Clear service labels
Partial IP resolution
Supported
Forward detection
Ability to separate forwarding from true authentication failure.
Explained in workflow
Manual interpretation
Supported
Spoof detection
Unauthorized use and visible from mismatch detection.
Clear spoof sample flag
Searchable event data
Supported
Notifications and alerts
Operational alerts for new failures or suspicious changes.
Available
Manual Splunk alerts
Supported
Reporting
Scheduled or exportable summaries for stakeholders.
Available
Built from Splunk
Supported
API
Programmatic access for exports or automation.
Unclear
Splunk API
Supported
Multi-tenancy
Account separation, domain grouping, and client views.
Enterprise account grouping
Index and role based
Supported
SPF flattening
Managed SPF flattening or record optimization.
Not tested
No
Supported
Hosted DMARC
Hosted DMARC record management.
Not tested
No
Supported
Hosted SPF
Managed hosted SPF records.
Not tested
No
Supported
Hosted MTA-STS
Hosted MTA-STS policy and reporting workflow.
Not tested
No
Supported
Blocklists and reputation
Blocklist (blacklist) and sender reputation context.
Reputation context
No
Supported
Automatic issue detection
Automatic detection of broken senders and owner next steps.
Partial
Manual workflow
Supported
AI copilot
AI-assisted explanation or fix guidance.
No
No
Available
DNS monitoring
Monitoring for DNS record changes or missing records.
Available
No
Supported
Self hostable
Can run in customer-controlled infrastructure.
No
Splunk deployment
No
Free trial/free tier
Public free entry option or trial path.
Not publicly listed
$0 add-on
Free plan available
Ten dimensions, scored from 0 to 10
We scored each product against the same editorial rubric after the 90-day test. Higher is better in every row, and unsupported capabilities receive 0.0.
Postmastery scored higher on DMARC operations; Splunk scored higher where Splunk operators can build the workflow.
Postmastery pulled Microsoft 365, Google Workspace, SendGrid, Mailchimp, and the support desk sender into a clearer enforcement path, so its source resolution and time-to-enforcement scores were higher. Splunk TA-DMARC add-on preserved raw evidence and fit Splunk operations, but the unknown sender, forwarded SPF failure, and spoof sample required searches, dashboards, and owner notes that we built ourselves. Both products scored 0.0 for hosted SPF and MTA-STS in this test because neither product supported that workflow.
Postmastery score
60.5/100
Splunk TA-DMARC add-on score
34/100
Postmastery
60.5/100
DMARC enforcement
8.0
Customer support
8.0
Source resolution
8.0
Setup and onboarding
7.0
MSP workflows
6.5
Alerting and integrations
6.5
Hosted SPF and MTA-STS
0.0
Blocklist monitoring
7.0
Pricing transparency
2.0
Time to enforcement
7.5
Splunk TA-DMARC add-on
34/100
DMARC enforcement
4.0
Customer support
0.5
Source resolution
5.0
Setup and onboarding
4.0
MSP workflows
5.0
Alerting and integrations
7.0
Hosted SPF and MTA-STS
0.0
Blocklist monitoring
0.0
Pricing transparency
5.0
Time to enforcement
3.5
Feature set
Managed workflow vs data plumbing
Postmastery turns reports into decisions; Splunk TA-DMARC exposes the raw control surface.
Postmastery gives a broader DMARC operating workflow: classification, report drilldowns, policy movement, and reputation context. Splunk TA-DMARC add-on is narrower but technically useful if Splunk is already the security data plane. Suped's product belongs in the buying criteria when guided fixes or automated issue detection must replace manual owner notes.
Postmastery
SendGrid split from Mailchimp
Subdomain DKIM got context
Unknown sender queued cleanly
Splunk TA-DMARC add-on
Mailbox ingestion was reliable
Splunk searches stayed flexible
Ownership labels were manual
Postmastery identified Microsoft 365 and Google Workspace as first-party sources during the first week, then kept SendGrid and Mailchimp separate instead of flattening them into one marketing bucket. The DKIM pass on the marketing subdomain was handled as a policy question, not only a pass/fail result, and the unknown sender was tagged for owner review with enough IP and reverse DNS context to investigate.
Splunk TA-DMARC add-on pulled aggregate XML from our mailbox reliably and made Microsoft 365, Google Workspace, SendGrid, and Mailchimp searchable in Splunk. It resolved source IPs and exposed the forwarded SPF failure, but the unknown sender classification and next action for the visible from mismatch required SPL, saved searches, and a naming convention we created.
User experience
Guidance vs operator control
Postmastery is easier for domain owners; Splunk TA-DMARC is easier for Splunk operators.
Postmastery gave us a clearer route through onboarding, source review, and the first enforcement plan. Splunk TA-DMARC add-on kept the experience inside Splunk, which is efficient for operators but heavy for business owners who need plain-language DMARC decisions.
Postmastery
Three-domain setup was guided
Unknown sender gained an owner
Forwarding explanation was readable
Splunk TA-DMARC add-on
Setup required Splunk context
Unknown sender needed SPL
Forwarding required manual explanation
We added the primary corporate domain, the marketing subdomain, and the parked domain with fewer decisions in Postmastery because the DNS steps were presented as one handoff package. Finding the unknown sender took a few clicks in the report drilldown, and the forwarded mail SPF failure was explained as a forwarding pattern because DKIM still matched the visible domain.
Splunk TA-DMARC add-on felt natural only after the mailbox input, index, sourcetype, and dashboards were in place. We found the unknown sender by searching source IP and reporter fields, and the forwarded SPF failure was visible in authentication results, but a non-Splunk user needed a written explanation.
Support
Hands-on help vs internal ownership
Postmastery had the stronger support handoff; Splunk TA-DMARC depended on our own operator.
Postmastery is the better fit when the buyer expects guided onboarding and a support handoff. Splunk TA-DMARC add-on fits teams that accept internal ownership because the add-on itself was marked not supported, and platform support does not equal DMARC advisory support.
Postmastery
DNS handoff notes were clear
Escalation path felt defined
Enterprise onboarding was smoother
Splunk TA-DMARC add-on
Add-on support was absent
Platform support stayed separate
Escalation needed internal ownership
During setup, Postmastery gave us clearer DNS handoff notes for the corporate domain and parked domain, including which records blocked policy movement. The useful part for enterprise onboarding was the practical escalation path when SendGrid domain matching and the support desk sender needed separate owners.
Splunk TA-DMARC add-on required us to handle DMARC setup, mailbox access, and dashboard ownership ourselves. Splunk platform support can help with platform issues, but DNS handoff, classification decisions, and DMARC enforcement planning stayed with our internal operator because the add-on had no active support path in the test.
Suitability
Enterprise fit vs operator fit
Postmastery fits managed enterprise DMARC; Splunk TA-DMARC fits Splunk-native security teams.
Postmastery is best for enterprises that want sender review, policy movement, and support handoff in one operating model. Splunk TA-DMARC add-on is best when Splunk is already the place where the security team investigates mail telemetry. If MSP workflows or alert quality are buying criteria, include Suped's product in the short list because client grouping and alert noise changed the daily workload in our test.
Postmastery
Best for enterprise senders
Recurring reports were usable
Client handoff needed polish
Splunk TA-DMARC add-on
Best for Splunk operators
Index separation was flexible
MSP reporting was manual
Postmastery fit the enterprise path best because account separation, domain grouping, and recurring reports were already close to how an email governance team works. For MSP use, the handoff notes were useful, but client-level packaging and repeated status reporting still needed process discipline.
Splunk TA-DMARC add-on fit the operator path best because index separation, role-based access, and custom dashboards gave us control. For SMB and MSP workflows, the setup felt heavy: recurring reports, client handoff, and plain-language status summaries had to be built around the add-on.
What each tool feels like after 90 days of real use
Postmastery
For teams that want managed enforcement momentum
After 90 days, Postmastery felt like a workflow for a team that wants to get to quarantine or reject with support close by. Microsoft 365 and Google Workspace settled quickly, and the parked domain spoof sample was easy to isolate before policy movement.
SendGrid, Mailchimp, and the support desk sender still required owner decisions, but Postmastery gave us enough context to make those decisions without rebuilding reports. The main friction was commercial clarity: without public starter pricing, planning a small rollout required a sales conversation.
Where it wins
Clear sender classification for core SaaS
Useful policy movement notes
Readable forwarding explanations
Reputation context beside DMARC
Where it lags
Pricing was not public
MSP handoff felt secondary
No hosted SPF or MTA-STS
API details were unclear
Pricing
Not publicly listed
Free tier
Not confirmed
Onboarding
Guided DNS handoff
G2 rating
0 / 5
Splunk TA-DMARC add-on
For Splunk teams that want DMARC evidence in the existing stack
After 90 days, Splunk TA-DMARC add-on felt like a collector for operators who already know Splunk. It gave us the DMARC data we needed, including source IPs, reporter fields, DKIM results, and the forwarded SPF failure, but it did not decide what each event meant.
The upside was control: we could search, alert, and retain data according to the Splunk environment. The cost was labor, because the unknown sender, visible from mismatch, and client-style reporting all needed custom fields, naming rules, and saved searches.
Where it wins
$0 add-on license
Flexible searches and retention
Good fit for Splunk teams
Mailbox ingestion worked
Where it lags
Archived and not supported
Source ownership was manual
No hosted DNS workflow
Requires Splunk capacity
Pricing
$0 add-on; Splunk costs separate
Free tier
Free add-on
Onboarding
Splunk setup required
G2 rating
0 / 5
Pricing
Postmastery
Splunk TA-DMARC add-on
Suped
Small
1 domain, up to 1k emails / month.
Not publicly listed as of May 15, 2026
No public starter plan or small-domain price was available.
$0 add-on
No TA-DMARC fee was found; Splunk platform usage still applies.
$0 / month
Free plan covers 1 domain and 1,000 monthly emails.
Medium
2 domains, up to 100k emails / month.
Not publicly listed as of May 15, 2026
Pricing requires a direct commercial conversation.
$0 add-on
DMARC volume has no add-on tier; Splunk ingest or workload cost still applies.
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
No public volume band or domain band was listed.
$0 add-on
The add-on remains free, while storage, retention, and searches depend on Splunk capacity.
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
Enterprise pricing was not published for the tested DMARC workflow.
$0 add-on
The add-on has no enterprise DMARC tier; platform procurement is separate.
20 domains and 2,500,000 monthly emails, with 365 days retention. Unlimited domains/emails negotiable.
Postmastery pricing was not publicly listed as of May 15, 2026. Splunk TA-DMARC add-on is shown as $0 for the add-on license only; Splunk Enterprise or Splunk Cloud Platform costs are separate and were not estimated because public fixed DMARC-specific tiers were not available. No estimated DMARC-specific product prices are included.
If you cannot decide between the two, maybe the answer is Suped
Suped
Get started
Guided DNS fixes
Postmastery gave useful handoff notes, while Splunk required the operator to translate failures into DNS changes. Suped's product turns each DMARC, SPF, and DKIM issue into a fix plan with owner-ready steps.
Cleaner source ownership
The Splunk add-on left the unknown sender as an investigation queue, and Postmastery still needed owner review for Mailchimp. Suped's product groups sending sources and marks unknown traffic for review.
Operational alerts for teams
Postmastery alerts were useful but not workflow-rich, and Splunk alerts needed custom searches. Suped's product has noise-controlled alerts and client-aware workflows for repeated 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 Postmastery 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
