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Postmark Security & Compliance Status

Before you share customer data with Postmark, your compliance team needs documented proof they can be trusted. ThirdProof investigated Postmark across 27 intelligence sources — here's what we found.

⚠ FedRAMP Status: Not found in the FedRAMP Marketplace. Vendors handling government data or CUI must be FedRAMP authorized.

Risk Tier
Tier 3 — Moderate Risk
SOC 2
— Not Found
FedRAMP
— Not Authorized
Last Assessed
Mar 25, 2026
🟢IP Reputation: Abuse score: 0%, 0 reports🟡SSL/TLS: TLSv1.3🟢Domain Age: 16.8 years🟢Infrastructure: 13 open ports, 0 CVEs
FedRAMP Status
Postmark is not listed on the FedRAMP Marketplace as of March 2026.
SOC 2 Status
Postmark has not had a SOC 2 claim detected on their trust page.
Sanctions Screening
Postmark returned no matches in OFAC SDN, EU Consolidated, and UN sanctions screening.
Risk Tier
ThirdProof assigned Postmark a Moderate Risk tier with 90% confidence across 27 intelligence sources.

27 sources checked. Every investigation delivers two audit-ready artifacts: a risk report and an auto-filled security questionnaire — built from independent evidence, not vendor self-attestation.

Get Postmark's Full Report Free →
No credit card|Risk report + auto-filled questionnaire|SOC 2 CC9.2 ready

Certification & Compliance Status

Need a complete vendor security questionnaire?

Run a full ThirdProof investigation to get 133 security questions auto-filled with source evidence — ready for your next audit or vendor onboarding review.

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✗Not Listed on FedRAMP Marketplace

Verified against FedRAMP Marketplace API as of March 2026

Organizations with federal compliance requirements should verify this directly at marketplace.fedramp.gov.

Postmark is not listed on the FedRAMP Marketplace.

Source: FedRAMP Marketplace

FedRAMP authorized vendors →
◇27 data sources queried per assessment
◷Reports generated in an average of 7 minutes
◈SHA-256 verified for audit integrity
✓Deterministic risk scoring — no AI guesswork
Risk Tier
Tier 3 — Moderate Risk
Assessment
Conditional
Confidence
90%

Assessment Preview — 23 Sources Queried

Sanctions ScreeningClear — No matches found
SSL/TLS GradeTLSv1.3
HTTP SecurityC- (45/100)
Domain ReputationClean (no malware associations)
Infrastructure13 open ports, 0 CVEs
Malware & PhishingClean
IP ReputationAbuse score: 0%, 0 reports
Domain Age16.8 years

Run your own investigation to see the full evidence chain, compliance assessment, and recommended actions.

Get Postmark's Full Report Free →

Executive Summary Preview

Postmark (postmarkapp.com) is an established transactional and marketing email delivery service with a 16-year operational history, assessed at Tier 3 (Moderate Risk) with a 90% confidence score. This rating reflects a combination of strong foundational signals alongside notable transparency gaps that warrant structured follow-up before onboarding at medium data access levels.

This is an excerpt. Run your own investigation to see the full assessment. Get Postmark's Full Report Free →

Key Findings for Postmark

SeverityFindingSource
infoTLS certificate renewal approachingDomain Analysis
infoClean domain reputationThreat Intelligence
low13 open ports detectedInfrastructure Exposure
lowNo subprocessor page foundSupply Chain & Subprocessor Discovery
mediumNo public AI data usage policy foundAI Data Usage Policy

6 total findings. Get Postmark's Full Report Free →

Recommended Actions

  1. Request Postmark's SOC 2 Type II report and bridge letter — email security@postmarkapp.com or check postmarkapp.com/legal for a trust portal link. Many email delivery vendors maintain confidential trust pages accessible via NDA. Set a 20-business-day response deadline and document receipt in your vendor risk register.
  2. Request a signed Data Protection Addendum (DPA) and subprocessor list before go-live, particularly if EU personal data will be transmitted. Ask specifically whether AWS and any other infrastructure providers are disclosed as subprocessors, and confirm the DPA includes a 30-day advance notice commitment for subprocessor changes.
  3. Ask Postmark's security team directly whether AI or machine learning is applied to customer email content, whether any third-party AI providers receive access to email data, and whether customer data is used in model training. Request a written response or addendum to your DPA documenting the AI data handling position.
Get Postmark's Full Report Free →
183+
Vendors assessed
98%
Average confidence
<2 min
Time to report

Intelligence Sources Queried for Postmark

✓Sanctions & Watchlists
✓Business Registration
✓Adverse Media Scan
✓Company Intelligence
✓Domain Analysis
✓Infrastructure Exposure
✓Domain Registration
✓Threat Intelligence
✓Tech Community Sentiment
✓HTTP Security Scan
✓SSL/TLS Analysis
✓Certificate Transparency
✓Web Archive History
✓Threat Intel (OTX)
✓IP Reputation
✓Malware & Phishing Check
✓Website Security Scan
✓Trust & Compliance Scan
✓Subprocessor Discovery
✓FDIC Registry Check
✓SEC Filing Search
✓Historical Media Search
✓Certification Registry

ThirdProof uses a deterministic rules engine to assign risk tiers. AI writes the narrative — rules drive the decision.

What a ThirdProof assessment covers↓

Sanctions Screening

Is Postmark on any OFAC, EU, or UN sanctions list? Are any officers or affiliates flagged?

Cyber Risk Assessment

What is Postmark's security posture? Threat intelligence scanning, known vulnerabilities, and security header analysis.

Business Registration

Is Postmark a legitimately registered business entity? Corporate status, jurisdiction, and officer verification.

Adverse Media Analysis

Has Postmark appeared in negative news coverage? Data breaches, lawsuits, regulatory actions, and complaints.

Domain & Infrastructure

Is Postmark's website secure? TLS configuration, DNS hygiene, security headers, and domain age analysis.

Company Intelligence

What are Postmark's firmographics? Employee count, industry classification, technology stack, and corporate structure.

Trust & Compliance Verification

Does Postmark claim SOC 2, ISO 27001, HITRUST, or FedRAMP? ThirdProof scans trust pages for certification claims and cross-references the FedRAMP public registry for independent verification.

Supply Chain & Subprocessor Discovery

Who does Postmark depend on? ThirdProof discovers subprocessors from vendor-published pages and runs sanctions screening and safe browsing checks against each one.

Regulatory & Financial Filings

Has Postmark appeared in SEC enforcement filings? Is it associated with any FDIC bank failures? ThirdProof searches regulatory databases with entity verification to confirm attribution.

Full methodology, rule engine, and AI disclosure: /methodology

Seeing this in an audit? ThirdProof lets you investigate Postmark and every other vendor in your stack — average report time: 7 minutes. Get Postmark's Full Report Free →

Frequently asked about Postmark

Is Postmark FedRAMP authorized?+
Postmark is not currently listed on the FedRAMP Marketplace as of March 2026.
Does Postmark have SOC 2 Type II?+
No SOC 2 found. Postmark rated Moderate Risk — 13 open ports detected. See all 6 findings →
Is Postmark on the OFAC sanctions list?+
Postmark returned no matches in ThirdProof's OFAC SDN, EU Consolidated, and UN sanctions screening as of March 2026.
What is Postmark's vendor risk tier?+
ThirdProof assigned Postmark a risk tier of Moderate Risk with 90% confidence based on assessment across 27 intelligence sources as of March 2026.
Can I get an auto-filled security questionnaire for Postmark?+
Yes. Every ThirdProof investigation of Postmark produces two deliverables: an audit-ready risk report and a 133-question security questionnaire pre-filled with evidence from 27 independent sources. The questionnaire is mapped to SIG, SOC 2, HIPAA, PCI DSS and 9 other frameworks — answered without sending Postmark a single email or waiting for a vendor response.
Is Postmark safe to use as a vendor?+
Postmark is a email delivery vendor that handles organizational data. Safety depends on their current security posture, certification status, and how they handle your specific data. ThirdProof automates this evaluation across 27 intelligence sources — sanctions databases (OFAC, EU, UN), business registration verification, adverse media scanning, and cyber risk assessment — producing a deterministic risk tier with confidence score plus an auto-filled security questionnaire. Run a free investigation to see Postmark's full risk profile.
Does Postmark have SOC 2 certification?+
No SOC 2 found. Postmark rated Moderate Risk — 13 open ports detected. See all 6 findings →
Has Postmark had any data breaches?+
Data breach history is an important signal for any vendor, particularly email delivery platforms like Postmark that handle organizational data. ThirdProof's adverse media analysis searches multiple news APIs and public records for data breaches, security incidents, lawsuits, regulatory enforcement actions, and financial distress signals. Each finding is linked to its original source with severity classification.
Is Postmark on any sanctions lists?+
Sanctions screening is standard due diligence for email delivery vendors. ThirdProof screens Postmark against OFAC SDN, consolidated international sanctions lists, and PEP databases. The screening uses entity name verification to reduce false positives. If Postmark or any associated officers appear on a sanctions list, this triggers automatic escalation to the highest risk tier.
How do I assess Postmark for vendor risk?+
Assessing Postmark as a email delivery vendor involves verifying SOC 2 Type II and applicable industry standards compliance, reviewing their subprocessor chain, and checking sanctions exposure. ThirdProof automates this across 27 intelligence sources in an average of 7 minutes — no questionnaires or vendor participation required. Your first 5 investigations are free.
How long does a ThirdProof assessment take?+
A ThirdProof assessment completes in an average of 7 minutes. 27 intelligence sources are queried in parallel — sanctions databases, business registries, threat intelligence feeds, certificate transparency logs, and more. The result is a deterministic risk tier with confidence score and audit-ready PDF report.
Is ThirdProof free?+
ThirdProof offers 5 free vendor assessments with no credit card required. Each assessment includes the full report — risk tier, confidence score, individual findings, executive summary, and PDF export. Paid plans start at $399/month for teams that need ongoing vendor monitoring.
Can I use a ThirdProof report as SOC 2 audit evidence?+
Yes. ThirdProof reports are designed to satisfy SOC 2 CC9.2 (vendor risk management) requirements. Each report includes SHA-256 integrity verification, methodology disclosure, source attribution for every finding, and AI content labeling. Auditors can independently verify the report's authenticity and trace each finding to its original source.
How is ThirdProof different from a security questionnaire?+
Security questionnaires require vendor participation, take weeks, and produce self-reported answers. ThirdProof queries 27 independent intelligence sources — no vendor involvement needed. Risk tiers are assigned by a deterministic rules engine (not AI opinion), and every finding links to its original source. You get an audit-ready report in an average of 7 minutes instead of waiting weeks for a questionnaire response.

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Postmark is in your vendor stack. Can you prove you assessed them?

SOC 2 CC9.2, HIPAA, PCI-DSS, and CMMC all require documented vendor due diligence — not just knowing the answer, but having audit-ready evidence you verified it. Most compliance teams can't produce that documentation on demand.

ThirdProof investigates Postmark across 27 intelligence sources in an average of 7 minutes — sanctions screening, cyber posture, SOC 2 verification, FedRAMP status, and more. Every investigation produces two deliverables: an audit-ready risk report and an auto-filled security questionnaire your prospects and auditors expect to see.

Get Postmark's Full Report Free →See PricingBook a Demo
✓ 5 free investigations✓ Risk report + auto-filled questionnaire✓ No credit card required✓ Average report time: 7 minutes

Replaces $600–$900 in manual compliance consulting time per vendor assessed.