PingMyUsers

Postmark

Postmark, owned by ActiveCampaign, sends and receives application email through a REST API and SMTP, with separate transactional and broadcast message streams. Plans are monthly USD subscriptions with included volume and per-1,000 overage, plus a free developer plan of 100 emails a month.

Transactional email

API documentationMCP server

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Overall rating

55.6coverage 97 % · evidence strongVisit postmarkapp.com

Strengths, weaknesses and fit

Strengths

  • Free forever: 100 emails per month (Transactional email)
  • Official MCP server
  • Official agent skills published
  • Test mode or test credentials documented
  • Official SDKs in 6 languages

Weaknesses

  • Webhooks are not signed
  • No OAuth 2.0 — API keys only
  • Limited channels: Email only

Not a fit if…

  • you must verify that callbacks really come from the provider
  • you build a multi-tenant app that acts on customers' own accounts
  • you want several channels from one provider

Generated from threshold rules over the dated facts below, not written by hand. Rules with unverified inputs are skipped.

Transactional email: Postmark Email API and SMTP (Message Streams)

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SupportNativeOfficial docsPostmark llms.txt
OutboundYesOfficial docsEmail API
InboundYesOfficial docsProcessing email (inbound)Postmark pricing
SMTP relayYesOfficial docsSending email with SMTPPostmark pricing
Inbound parsingYesOfficial docsProcessing email (inbound)Postmark pricing
TemplatesYesOfficial docsTemplates APIEmail templates
Event webhooksYesOfficial docsWebhooks overviewWebhooks API
Suppression mgmtYesOfficial docsSuppressions APIPostmark pricing
Dedicated IPYesOfficial docsDedicated IPsPostmark pricing (plain-text version for agents)
Log retentionYesOfficial docsHow does the Retention Add-on work?Postmark pricing
SchedulingNoOfficial docsCan you schedule emails with Postmark?
AttachmentsYesOfficial docsPostmark llms.txtAPI overview (endpoint, authentication, error codes)
Payment notificationsYesOfficial docsEmail templatesTemplates API
Native payment-provider integrationPartialOfficial docsPostmark App for StripePostmark integrations
CountryAvailabilityRestrictionsPayment scenarios
United StatesYesOfficial docsPostmark pricing (plain-text version for agents)Postmark Terms of Service (new customers)New accounts can send only to domains they have added and verified until a manual review approves them (under 24 hours on weekdays). Transactional and broadcast mail must use separate streams, and broadcast mail needs an opt-out link. Postmark asks senders to keep spam complaints below 0.1% and bounces below 10%.Official docsHow does the account approval process work?What types of messages are a good fit for Postmark?YesOfficial docsEmail templatesWhat types of messages are a good fit for Postmark?
BrazilYesOfficial docsPostmark pricing (plain-text version for agents)Postmark Terms of Service (new customers)New accounts can send only to domains they have added and verified until a manual review approves them (under 24 hours on weekdays). Transactional and broadcast mail must use separate streams, and broadcast mail needs an opt-out link. Postmark asks senders to keep spam complaints below 0.1% and bounces below 10%.Official docsHow does the account approval process work?What types of messages are a good fit for Postmark?YesOfficial docsEmail templatesWhat types of messages are a good fit for Postmark?
MexicoYesOfficial docsPostmark pricing (plain-text version for agents)Postmark Terms of Service (new customers)New accounts can send only to domains they have added and verified until a manual review approves them (under 24 hours on weekdays). Transactional and broadcast mail must use separate streams, and broadcast mail needs an opt-out link. Postmark asks senders to keep spam complaints below 0.1% and bounces below 10%.Official docsHow does the account approval process work?What types of messages are a good fit for Postmark?YesOfficial docsEmail templatesWhat types of messages are a good fit for Postmark?

Postmark pricing

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Prices as printed on the vendor's pages, in the vendor's currency. Scenario totals are computed from the listed components; carrier and Meta pass-through fees are shown separately and are not in the totals.

Transactional email

Same prices in United States, Brazil and Mexico.

PlanPriceSource
Free (developer plan)FreeOfficial docs
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Basic (10,000 emails)
$15.00 / month
Official docs
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Basic (50,000 emails)
$55.00 / month
Official docs
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Basic (125,000 emails)
$115.00 / month
Official docs
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Pro (10,000 emails)
$16.50 / month
Official docs
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Pro (50,000 emails)
$60.50 / month
Official docs
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Pro (125,000 emails)
$126.50 / month
Official docs
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Platform (10,000 emails)
$18.00 / month
Official docs
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Platform (50,000 emails)
$66.00 / month
Official docs
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Platform (125,000 emails)
$138.00 / month
Official docs
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  • 10,000 emails / month: $15.00 on Basic (10,000 emails)
  • 100,000 emails / month: $115.00 on Basic (125,000 emails)

Transactional email: free access

Free forever: See detailsOfficial docsPostmark pricingPostmark pricing (plain-text version for agents)

Trial: NoneOfficial docsPostmark pricing (plain-text version for agents)

Developer & AI readiness

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API keysYesOfficial docsAPI overview (endpoint, authentication, error codes)auth.md (agent authentication guide)
Bearer tokenNoOfficial docsauth.md (agent authentication guide)
Basic authNoOfficial docsAPI overview (endpoint, authentication, error codes)Sending email with SMTP
OAuth 2.0NoOfficial docsauth.md (agent authentication guide)Postmark MCP server card
Restricted (scoped) keysPartialOfficial docsauth.md (agent authentication guide)Postmark pricing
Key rotationYesOfficial docsauth.md (agent authentication guide)EU Data Protection (security, GDPR, DPA, sub-processors)
Official SDKsNode.js/TypeScript, Python, Ruby, .NET, Java, PHPOfficial docsOfficial Postmark librariespostmark-python on PyPI (official Python SDK)
OpenAPI specpostmarkapp.com/swagger/server.ymlOfficial docsPostmark Server API definition (Swagger 2.0)Postmark Account API definition (Swagger 2.0)
llms.txtpostmarkapp.com/llms.txtOfficial docsPostmark llms.txt
AI-oriented docspostmarkapp.com/developer/integration/ai-p…Official docsAI PromptsPostmark AI catalog
Test modeYesOfficial docsAPI overview (endpoint, authentication, error codes)Server sandbox mode
Idempotency keysNoOfficial docsWhat is an idempotency key?Email API

MCP server

Official · local

Official docsPostmark MCP server (@activecampaign/postmark-mcp)

Webhook signatures

Not signed

Official docs

Agent skills

OfficialOfficial docs

No-code and manual editing

Template editorYesOfficial docsEmail templates
Edit code and visual togetherYesOfficial docsTemplates APIEmail templates

Works with AI app builders

Server code needed on every builder: YesOfficial docsauth.md (agent authentication guide)Webhooks overview

PlatformNative integrationOfficial guideSecrets
Claude CodeYesOfficial docsActiveCampaign/postmark-skillsTeach your AI coding agent how to send email with Postmark Skillspostmarkapp.com/blog/teach-your-ai-coding-…Official, otherTeach your AI coding agent how to send email with Postmark SkillsEnvironment variable POSTMARK_SERVER_TOKEN (Server API token)Official docsauth.md (agent authentication guide)Official Postmark libraries
CursorYesOfficial docsActiveCampaign/postmark-mcpPostmark MCP server pagepostmarkapp.com/lp/mcpOfficial, otherPostmark MCP server pageMCP client config env block (POSTMARK_SERVER_TOKEN)Official, otherPostmark MCP server page
ReplitNoOfficial, otherReplit Agent integrations overviewNoneOfficial, otherReplit Agent integrations overviewPostmark integrations—
LovableNoOfficial, otherLovable documentation index (llms.txt)NoneOfficial, otherLovable documentation index (llms.txt)Postmark integrations—

Paying and getting support locally

How customers pay the provider itself — separate from payment scenarios for your buyers.

United States

Billing methodscredit card, debit cardOfficial docsWhat payment methods does Postmark accept?Do you accept Invoice or ACH Billing?
Local payment methodsNoneOfficial docsWhat payment methods does Postmark accept?
Billing currenciesUSDOfficial docsPostmark pricingPostmark pricing (plain-text version for agents)
Local entity / tax invoiceYesOfficial docsPostmark Terms of Service (new customers)Managing Billing & Invoices
Interface languagesenOfficial docsPostmark pricing
Docs languagesenOfficial docsPostmark Developer Documentation
Support languagesenOfficial docsContact Postmark supportWhen can I chat with support?
Local officeYesOfficial docsPostmark Terms of Service (new customers)

Brazil

Billing methodscredit card, debit cardOfficial docsWhat payment methods does Postmark accept?Do you accept Invoice or ACH Billing?
Local payment methodsNoneOfficial docsWhat payment methods does Postmark accept?
Billing currenciesUSDOfficial docsPostmark pricing (plain-text version for agents)What payment methods does Postmark accept?
Local entity / tax invoiceNoOfficial docsPostmark Terms of Service (new customers)Managing Billing & Invoices
Interface languagesenOfficial docsPostmark pricing
Docs languagesenOfficial docsPostmark Developer Documentation
Support languagesenOfficial docsContact Postmark supportWhen can I chat with support?

Mexico

Billing methodscredit card, debit cardOfficial docsWhat payment methods does Postmark accept?Do you accept Invoice or ACH Billing?
Local payment methodsNoneOfficial docsWhat payment methods does Postmark accept?
Billing currenciesUSDOfficial docsPostmark pricing (plain-text version for agents)What payment methods does Postmark accept?
Local entity / tax invoiceNoOfficial docsPostmark Terms of Service (new customers)Managing Billing & Invoices
Interface languagesenOfficial docsPostmark pricing
Docs languagesenOfficial docsPostmark Developer Documentation
Support languagesenOfficial docsContact Postmark supportWhen can I chat with support?

Compliance & data protection

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What the vendor documents publicly. This is not a legal assessment and not a certification.

Data processing agreementYesOfficial docsData Processing Addendum (new customers)Postmark Terms of Service (new customers)
Subprocessor listYesOfficial docsEU Data Protection (security, GDPR, DPA, sub-processors)Data Processing Addendum (new customers)
Data residency optionsNoOfficial docsEU Data Protection (security, GDPR, DPA, sub-processors)Sending email with SMTP
Residency regionsUnited States (Deft data centre near Chicago; AWS)Official docsEU Data Protection (security, GDPR, DPA, sub-processors)
Transfer mechanismsEU-U.S. Data Privacy Framework (incl. UK Extension), Swiss-U.S. Data Privacy Framework, EU Standard Contractual Clauses (2021/914, Module Two), UK International Data Transfer Addendum, Brazil SCCs (ANPD Resolution CD/ANPD No. 19/2024)Official docsData Processing Addendum (new customers)
Security documentationDeft data-centre SOC report (on request, under NDA), DPA Annex II technical and organisational measuresOfficial docsEU Data Protection (security, GDPR, DPA, sub-processors)Data Processing Addendum (new customers)
Use of customer data for AI trainingPartialOfficial docsPostmark Terms of Service (new customers)
Local law page (BR)PartialOfficial docsData Processing Addendum (new customers)

How the rating is built

Methodology 2026.09-pre · weights of unknown criteria are redistributed; coverage shows how much of the score rests on verified facts.
CriterionWeightResultBasis
Pricing & Free Tier (25)49.0 / 100coverage 100 %
Free access (transactional-email)12.5040 %free forever: 100 emails / monthsrcsrc
Scenario price (transactional-email)10.0048 %10,000 emails / month: USD 15.00 vs peer median USD 15.00 (13 providers); 100,000 emails / month: USD 115.00 vs peer median USD 74.85 (13 providers)srcsrc
Pricing transparency (transactional-email)2.50100 %public self servesrcsrc
Developer & AI Readiness (28)62.5 / 100coverage 95 %
MCP7.7089 %official (local)srcsrcsrc
Agent skills2.10100 %officialsrcsrcsrc
Assistant apps0.700 %0 official assistant appssrcsrc
Llms.txt0.70100 %publishedsrc
OpenAPI0.70100 %publishedsrcsrcsrc
AI docs0.70100 %publishedsrcsrcsrc
Scoped keys1.4050 %partialsrcsrcsrc
OAuth4.480 %nosrcsrc
Webhook signing1.9620 %unsignedsrcsrcsrc
SDKs2.24100 %6 official SDK languagessrcsrcsrc
Test mode2.24100 %yessrcsrcsrc
Idempotency1.680 %nosrcsrcsrc
Reputation & Reviews (25)60.2 / 100coverage 100 %
Review platforms25.0060 %global data: capterra 4.7/5 (35), g2 4.6/5 (32), trustpilot 2.2/5 (45)
Channel Coverage (10)20.0 / 100coverage 100 %
Channel groups10.0020 %1 channel groups (native = 1, partner = 0.5)srcsrcsrc
Category Functionality (8)89.0 / 100coverage 100 %
SMTP relay (transactional-email)0.96100 %yessrcsrc
Inbound parsing (transactional-email)0.80100 %yessrcsrc
Templates (transactional-email)0.80100 %yessrcsrc
Event webhooks (transactional-email)1.12100 %yessrcsrc
Suppression mgmt (transactional-email)0.80100 %yessrcsrc
Dedicated IP (transactional-email)0.64100 %yessrcsrc
Log retention (transactional-email)0.64100 %yessrcsrc
Scheduling (transactional-email)0.480 %nosrc
Attachments (transactional-email)0.32100 %yessrcsrc
Payment notifications (transactional-email)0.64100 %yessrcsrc
Native payment-provider integration (transactional-email)0.8050 %partialsrcsrc
Localization & Regional Support (2)33.3 / 100coverage 100 %
Languages2.0033 %1 of 3 target languages (en, pt, es)srcsrc

Weights and rules: rating methodology.

Sources

  1. Postmark security — other, checked 23 September 2026
  2. Postmark and DMARC Digests have been acquired by ActiveCampaign — blog, checked 23 September 2026
  3. Message Streams — other, checked 23 September 2026
  4. Postmark pricing — pricing, checked 24 September 2026
  5. Postmark pricing (plain-text version for agents) — pricing, checked 24 September 2026
  6. Dedicated IPs — pricing, checked 23 September 2026
  7. How does the Retention Add-on work? — docs, checked 23 September 2026
  8. What payment methods does Postmark accept? — docs, checked 23 September 2026
  9. Do you accept Invoice or ACH Billing? — docs, checked 23 September 2026
  10. Managing Billing & Invoices — docs, checked 23 September 2026
  11. Postmark Developer Documentation — docs, checked 23 September 2026
  12. API overview (endpoint, authentication, error codes) — docs, checked 23 September 2026
  13. Email API — docs, checked 24 September 2026
  14. Sending email with SMTP — docs, checked 23 September 2026
  15. Processing email (inbound) — docs, checked 23 September 2026
  16. Templates API — docs, checked 23 September 2026
  17. Suppressions API — docs, checked 23 September 2026
  18. Webhooks overview — docs, checked 24 September 2026
  19. Webhooks API — docs, checked 23 September 2026
  20. Server sandbox mode — docs, checked 23 September 2026
  21. IP Allowlisting (API sends) — docs, checked 23 September 2026
  22. Official Postmark libraries — docs, checked 24 September 2026
  23. AI Prompts — docs, checked 24 September 2026
  24. Email templates — other, checked 23 September 2026
  25. Postmark integrations — other, checked 23 September 2026
  26. Can you schedule emails with Postmark? — docs, checked 23 September 2026
  27. How does the account approval process work? — docs, checked 23 September 2026
  28. What types of messages are a good fit for Postmark? — docs, checked 23 September 2026
  29. IPs for firewalls (SMTP, inbound, webhooks) — docs, checked 23 September 2026
  30. When can I chat with support? — docs, checked 23 September 2026
  31. Postmark App for Stripe — docs, checked 23 September 2026
  32. What is an idempotency key? — docs, checked 24 September 2026
  33. postmark-python on PyPI (official Python SDK) — registry, checked 24 September 2026
  34. postmark on PyPI (unrelated third-party package) — registry, checked 24 September 2026
  35. Contact Postmark support — other, checked 23 September 2026
  36. Postmark llms.txt — docs, checked 24 September 2026
  37. auth.md (agent authentication guide) — docs, checked 24 September 2026
  38. Postmark AI catalog — docs, checked 23 September 2026
  39. Postmark API catalog (RFC 9727 linkset) — docs, checked 23 September 2026
  40. Postmark Server API definition (Swagger 2.0) — docs, checked 24 September 2026
  41. Postmark Account API definition (Swagger 2.0) — docs, checked 23 September 2026
  42. Postmark MCP server card — docs, checked 24 September 2026
  43. Postmark MCP server page — other, checked 23 September 2026
  44. ActiveCampaign/postmark-mcp — repo, checked 24 September 2026
  45. Information regarding malicious "postmark-mcp" package — blog, checked 23 September 2026
  46. Postmark agent skills index — docs, checked 24 September 2026
  47. ActiveCampaign/postmark-skills — repo, checked 23 September 2026
  48. Teach your AI coding agent how to send email with Postmark Skills — blog, checked 23 September 2026
  49. Lovable documentation index (llms.txt) — platform-docs, checked 23 September 2026
  50. Replit Agent integrations overview — platform-docs, checked 23 September 2026