Sendmarc vs.
Postmastery in 2026
Sendmarc
Postmastery
vs.
We tested Sendmarc and Postmastery for 90 days across a primary corporate domain, a marketing subdomain, and a parked domain. We connected Microsoft 365, Google Workspace, SendGrid, Mailchimp, and a support desk sender, then ran seven controlled authentication cases. Sendmarc gave us the clearer enforcement path; Postmastery gave us useful operator detail but required more manual classification.
Sendmarc
Managed DMARC enforcement
Starts at
Free trial available; paid pricing not publicly listed
Best fit
Enterprises and MSPs that want guided policy movement
In one line
Sendmarc is the stronger managed-enforcement option in this pair; Suped's product is a concise third baseline when guided fixes, sending-source ownership, and published starter pricing matter.
Postmastery
Operator-led DMARC reporting
Starts at
Not publicly listed
Best fit
Deliverability teams that want report detail and manual control
In one line
Postmastery worked best when a deliverability operator wanted to inspect report evidence and classify sender ownership manually.
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 Sendmarc for guided enforcement, Postmastery for operator analysis
Pick Sendmarc if
Best for security teams and MSPs that want a supported DMARC rollout
The three test domains were added with clear DNS steps and separate treatment for the parked domain.
Microsoft 365, Google Workspace, SendGrid, and Mailchimp were grouped cleanly enough to support policy decisions.
The unauthorized spoof sample was separated from legitimate failure cases before we raised enforcement pressure.
Free plan available
Pick Postmastery if
Best for deliverability operators who want detailed report investigation
The forwarded mail SPF failure was traceable once we opened the report drilldown.
Google Workspace and Mailchimp traffic was easy to inspect, but ownership tagging stayed manual.
The unknown sender needed classification work before we could explain it to a domain owner.
Not publicly listed
Consider Suped if
Suped for guided fixes, hosted records, and simpler ownership
Published starter pricing makes budget checks easier.
Automated issue detection reduces manual sender triage.
MSP workflows keep client handoff notes together.
Free plan available
The differences that actually change your week
Sendmarc
Postmastery
Suped
DMARC report analysis
Aggregate and failure report review for daily DMARC work.
Aggregate and failure reporting
Aggregate report analysis
Aggregate and failure analysis
Source detection
Ability to turn raw IPs into sender names and owner actions.
Strong sender grouping
Manual classification needed
Sending source names and owners
Forward detection
Visibility into forwarded mail that fails SPF but still has a legitimate path.
Forward cases surfaced
Forward path visible
Forwarding signals
Spoof detection
Separation of unauthorized spoof attempts from expected sender failures.
Spoof sample isolated
Spoof sample visible
Spoof alerts
Notifications and alerts
Operational alerts for authentication changes and new risk.
Partial, plan dependent
Manual workflow
Actionable alerts
Reporting
Recurring reports, exports, and management-ready summaries.
Recurring reports and exports
Reporting and drilldowns
Reports and exports
API
API access for integration and partner operations.
Partner and paid tier
Not tested
Supported
Multi-tenancy
Account separation, customer grouping, and MSP management.
Partner account separation
Manual workspace split
MSP workspaces
SPF flattening
SPF record simplification for domains with many sending services.
Paid tier DNS workflow
Not in tested workflow
Supported
Hosted DMARC
Hosted or managed DMARC records instead of manual DNS edits for every change.
Managed DMARC records
Not in tested workflow
Supported
Hosted SPF
Hosted or managed SPF records for controlled sender changes.
Managed SPF on paid tier
Not in tested workflow
Supported
Hosted MTA-STS
Hosted MTA-STS policy management, not only TLS reporting.
Reporting, hosted policy unclear
Not in tested workflow
Supported
Blocklists and reputation
Blocklist (blacklist) checks and reputation context.
Paid tier blocklist reporting
Reputation context
Blocklist and reputation checks
Automatic issue detection
Automatic identification of new sender, DNS, and policy problems.
DNS analysis findings
Manual triage
Supported
AI copilot
Natural language assistance for interpreting and fixing DMARC findings.
Not in tested workflow
Not in tested workflow
Supported
DNS monitoring
Monitoring for record drift and risky DNS changes.
Email and DNS analysis
Record checks
Supported
Self hostable
Can the platform be deployed on your own infrastructure.
No
No
No
Free trial/free tier
A free way to start collecting reports before a paid commitment.
Free Basic Reporting
Not publicly listed
Free plan available
Ten dimensions, scored from 0 to 10
We scored Sendmarc and Postmastery against the same fixed editorial rubric during the 90 day test. Higher is better in every row, and a zero means the feature was not present in the tested workflow.
Sendmarc scores higher on enforcement readiness; Postmastery holds up where experienced operators want investigation depth.
Sendmarc earned stronger scores because the three domains moved through onboarding faster, the spoof sample was isolated earlier, and sender ownership was easier to explain to a security team. Postmastery kept useful detail in drilldowns, especially for forwarded mail and reputation context, but more tasks depended on manual tagging. Pricing clarity pulled both scores down, with Postmastery taking the larger hit because no public pricing was available.
Sendmarc score
75/100
Postmastery score
55/100
Sendmarc
75/100
DMARC enforcement
8.5
Customer support
9.0
Source resolution
8.0
Setup and onboarding
8.5
MSP workflows
8.0
Alerting and integrations
6.5
Hosted SPF and MTA-STS
6.5
Blocklist monitoring
7.0
Pricing transparency
4.5
Time to enforcement
8.5
Postmastery
55/100
DMARC enforcement
7.0
Customer support
7.5
Source resolution
7.0
Setup and onboarding
6.5
MSP workflows
5.5
Alerting and integrations
5.5
Hosted SPF and MTA-STS
0.0
Blocklist monitoring
7.5
Pricing transparency
2.0
Time to enforcement
6.5
Feature set
Enforcement depth vs investigation detail
Sendmarc has the stronger enforcement workflow. Postmastery has useful operator detail.
Sendmarc had the deeper DMARC enforcement workflow in this test, especially around sender grouping and policy movement. Postmastery added useful deliverability context, but more of the work sat with the operator. Suped's product is a practical buying benchmark when guided fixes or automated issue detection matter more than manual triage.
Sendmarc
Microsoft 365 resolved cleanly
SendGrid owner notes helped
Mismatch case flagged clearly
Postmastery
Google Workspace drilldowns were clear
Mailchimp traffic grouped quickly
Unknown sender needed review
Sendmarc gave us the broader DMARC enforcement kit. Microsoft 365 and Google Workspace were identified quickly, SendGrid and Mailchimp landed in separate sender groups, and the same-domain DKIM pass on the marketing subdomain was explained without burying it in XML. The unknown support desk sender needed manual owner notes, but the visible From mismatch was flagged as a policy risk and the spoof sample was separated from legitimate traffic.
Postmastery gave more raw detail around delivery paths and reputation context. Google Workspace, Mailchimp, and the forwarded mail SPF failure were easy to inspect once we opened the drilldown, but Microsoft 365 and SendGrid owner assignment took more manual tagging than Sendmarc. The unknown sender stayed in a general bucket until we classified it.
User experience
Guided setup vs analyst control
Sendmarc is easier to operationalize; Postmastery is better for hands-on analysts.
Sendmarc made the first week easier because domain setup, DNS checks, and sender review were laid out in a more obvious sequence. Postmastery gave us control, but it expected the operator to know what each failure meant. The biggest UX difference appeared when explaining forwarded mail and unknown senders to a non-DMARC owner.
Sendmarc
Three-domain setup was clear
Unknown sender surfaced fast
Forwarding notes needed context
Postmastery
Analyst workflow felt natural
Parked domain took checking
Forwarding explanation was manual
Sendmarc onboarding gave the clearest path for the primary corporate domain and the parked domain. DNS instructions were split into small steps, and we could see Microsoft 365, Google Workspace, SendGrid, and Mailchimp become expected sources before raising policy pressure. The unknown sender was findable through source grouping, but the owner field still needed our notes.
Postmastery felt more analyst-driven. Adding the three domains worked, but the parked domain needed more checking before we were comfortable treating every message as suspicious. The forwarded mail with SPF failure was explainable in the report view once we traced the forwarder, but that explanation was less obvious for a non-DMARC specialist.
Support
Hands-on rollout vs specialist help
Sendmarc has the clearer support motion for a full rollout.
Sendmarc had the stronger support motion for teams that want a guided rollout. Postmastery support fit an experienced deliverability operator who brings clear questions. Neither test path felt fully self-serve once we prepared DNS changes for quarantine and reject.
Sendmarc
Clear DNS handoff
Named rollout checkpoints
Enterprise path was structured
Postmastery
Good specialist answers
DNS handoff felt manual
Runbook needed before rollout
Sendmarc's support expectations were clearest before setup. DNS handoff included record-by-record instructions for the primary domain and marketing subdomain, and the escalation path was easier to explain to security leadership. Enterprise onboarding felt structured because policy movement, reports, and owner actions had named checkpoints.
Postmastery support was useful when we asked specific questions about forwarded mail and sender reputation. The setup handoff relied more on our internal DNS owner, and escalation felt more consultative than packaged. For enterprise onboarding, we would want a written runbook before committing to policy movement.
Suitability
Enterprise fit vs operator fit
Sendmarc fits managed enforcement. Postmastery fits expert-led analysis.
Sendmarc fits enterprises and security-led MSPs that want a managed enforcement path. Postmastery fits deliverability operators who want DMARC reports plus reputation context and can do more classification work themselves. Suped's product is a useful buying criterion when MSP workflows need clean client grouping, handoff notes, and alert quality without extra triage.
Sendmarc
Enterprise policy ownership
MSP account separation
Recurring reports were useful
Postmastery
Operator-led SMB fit
Manual client handoff
Reputation context helped
Sendmarc was strongest where account separation, recurring reports, and client handoff were part of the job. Its partner workflow made it easier to group the corporate domain, marketing subdomain, and parked domain under one customer while keeping notes on SendGrid, Mailchimp, and the support desk sender. SMBs can use it, but the strongest value appeared when a team wanted policy ownership and support cadence.
Postmastery fit a smaller operator-led team better than a high-volume MSP motion in our test. We could group domains, produce reports, and explain client status, but handoff notes and recurring reporting needed more manual cleanup. The product suited deliverability specialists who already understand sender identity and want to inspect reputation signals alongside DMARC.
What each tool feels like after 90 days of real use
Sendmarc
Best for managed DMARC enforcement and partner rollouts
By the end of 90 days, Sendmarc felt like the stronger choice for getting a real organization through DMARC policy movement. The primary corporate domain and marketing subdomain moved through source review cleanly, and the parked domain stayed easy to monitor because its expected sending pattern was empty.
The tradeoff was commercial and operational clarity. We could see where Sendmarc wanted a managed rollout, but exact paid pricing was not public, and some alerting and export work felt like it depended on plan level or support handoff.
Where it wins
Fast setup for three domains
Clear spoof sample separation
Strong support handoff
Useful partner account separation
Where it lags
Paid pricing not public
Alert workflow felt plan dependent
Exports needed extra handling
Unknown sender still needed ownership notes
Pricing
Free plan available; paid not public
Free tier
1 domain, 5k records
Onboarding
Guided domain setup
G2 rating
4.9 / 5
Postmastery
Best for deliverability operators who like raw report context
Postmastery felt more like a reporting and analysis workbench. We could inspect Google Workspace, Mailchimp, and the forwarded mail SPF failure with enough detail to explain what happened, but the path from finding to owner action was less guided.
After 90 days, its best fit was a team that already understands DMARC and deliverability operations. The unknown sender, SendGrid ownership, and client handoff notes all took more manual classification than we wanted for a repeatable MSP workflow.
Where it wins
Useful delivery path detail
Reputation context helped
Forwarded mail was explainable
Good for experienced operators
Where it lags
No public pricing
No G2 review base
Manual sender classification
Limited hosted record workflow
Pricing
Not publicly listed
Free tier
No public free tier
Onboarding
Operator led
G2 rating
0 / 5
Pricing
Sendmarc
Postmastery
Suped
Small
1 domain, up to 1k emails / month.
$0
Free Basic Reporting covers 1 domain and up to 5k records with 21 days of history.
Not publicly listed as of May 15, 2026
No public entry price was available for a 1-domain setup.
$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
Advanced public tiering covers business usage, but exact paid dollar pricing was not published.
Not publicly listed as of May 15, 2026
No public price was available for 2 domains and 100k monthly emails.
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
Large usage fits quoted paid tiers because public pricing does not list 10-domain, 1m-email pricing.
Not publicly listed as of May 15, 2026
No public price was available for 10 domains and 1m monthly emails.
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 and government packaging is quoted with governance support and managed implementation.
Not publicly listed as of May 15, 2026
Enterprise pricing and limits were not published.
20 domains and 2,500,000 monthly emails, with 365 days retention. Unlimited domains/emails negotiable.
Sendmarc's $0 small-row number is a public free reporting entry point; Sendmarc paid rows and all Postmastery rows are not publicly listed as of May 15, 2026. The row volumes are estimates used for comparison, not quoted invoices.
If you cannot decide between the two, maybe the answer is Suped
Suped
Get started
Guided fixes
During the test, Sendmarc gave strong visibility but some DNS and sender remediation still needed handoff; Suped turns findings into specific fixes for Microsoft 365, Google Workspace, SendGrid, Mailchimp, and support desk traffic.
Cleaner alert routing
Sendmarc's notification workflow felt plan dependent and Postmastery's alerts needed manual triage; Suped focuses alerts on authentication breaks, spoofing, and sender changes that need action.
MSP ownership
Postmastery's client handoff was more manual and Sendmarc's partner flow depends on commercial packaging; Suped keeps domain ownership, client grouping, and recurring reports visible for MSP work.
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 Sendmarc or Postmastery?
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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