# Postmark Postmark declares [2 subprocessors](https://thirdpartyindex.com/vendors/postmark#subprocessors) in [its subprocessor list](https://postmarkapp.com/eu-privacy#sub-processors), which we last checked on 2026-11-11 ([evidence](https://thirdpartyindex.com/evidence/4519)). They include [Amazon Web Services](https://thirdpartyindex.com/vendors/amazon-web-services). No published changes since we first read it on 2026-09-22. [149 tracked vendors](https://thirdpartyindex.com/vendors/postmark#used-by) name Postmark as a subprocessor, including [Twilio](https://thirdpartyindex.com/vendors/twilio), [SendGrid](https://thirdpartyindex.com/vendors/sendgrid) and [Segment](https://thirdpartyindex.com/vendors/segment). Postmark (postmarkapp.com): subprocessors, data processing agreement, security documents and changes, as monitored by Third Party Index. - Page: https://thirdpartyindex.com/vendors/postmark - Documents last verified: 2026-11-11 - Category: email - Transparency rating: 73/100 (how much it publishes, not how secure it is): Subprocessor list 30/30; Processing locations 0/8 (partial); Purposes 7/7; Data processing addendum 12/12; Trust center 0/8 (not found); Privacy policy 6/6; security.txt 0/6 (not found); Security page 5/5; Status page 5/5; Vulnerability disclosure 0/5 (not found); Pages still reachable 8/8 - Part of: [ActiveCampaign](https://thirdpartyindex.com/vendors/activecampaign) - Supply chain: relies on 1 tracked vendors directly, 5 within two hops, 20 within three; 149 tracked vendors rely on it directly, 1543 within two hops, 2713 within three - Cite as: Postmark, Third Party Index, https://thirdpartyindex.com/vendors/postmark (data CC BY 4.0) ## Documents | Document | URL | Last verified | Last changed | |---|---|---|---| | Subprocessor list | https://postmarkapp.com/eu-privacy#sub-processors | 2026-11-11 | 2026-09-22 | | Data processing addendum | https://postmarkapp.com/dpa | 2026-11-11 | 2026-09-27 | | Privacy policy | https://www.activecampaign.com/legal/privacy-policy | 2026-11-11 | 2026-10-26 | | Terms | https://postmarkapp.com/terms-of-service | 2026-11-11 | 2026-09-22 | | Security page | https://postmarkapp.com/security | 2026-11-11 | 2026-09-22 | | Status page | https://status.postmarkapp.com/ | 2026-11-11 | 2026-11-11 | | Trust center (parent company's) | https://trust.activecampaign.com/ | 2026-11-11 | 2026-11-10 | ## Subprocessors (2) As its own list states them. | Subprocessor | Purpose | Location | Listed since | |---|---|---|---| | [Amazon Web Services](https://thirdpartyindex.com/vendors/amazon-web-services.md) | Cloud infrastructure hosting | — | 2026-09-22 | | Deft (formerly known as ServerCentral) | Infrastructure hosting | — | 2026-09-22 | Read from ([evidence](https://thirdpartyindex.com/evidence/4519)). CSV: https://thirdpartyindex.com/vendors/postmark/subprocessors.csv ## Web Technologies Postmark's homepage made 64 requests to 12 domains, and 6 services controlled by another company. Loaded on 2026-11-05 by a browser that accepted nothing; other visits may load more or less. What a page loads is not a list of who receives customer data. 6 third parties by category: Advertising 2 (OpenAI, X Corp.); Analytics 2 (Google Cloud; usually detected as Analytics: SmartBear Software); Cookie compliance 1 (CookieYes); Unclassified 1 (Servd). Each company that appears controlled by another organization is counted once, under the main category of the technologies detected from it on this homepage or, when none was, the category recorded from the company's own page (marked reviewed) or else the one it is usually detected as on other published homepages (marked as such); unclassified: none of these. ### Third parties (6) - Google Cloud: 10 requests to google-analytics.com, googletagmanager.com, googlesyndication.com; Google Analytics, Google Tag Manager - CookieYes: 9 requests to cdn-cookieyes.com, cookieyes.com; CookieYes - Servd: 9 requests to svdcdn.com - OpenAI: 3 requests to openai.com; ChatGPT Ads Measurement Pixel - X Corp.: 3 requests to ads-twitter.com, t.co, twitter.com; Twitter Ads - SmartBear Software: 2 requests to bugsnag.com ### First party (1) - Postmark: 28 requests to postmarkapp.com; Cloudflare, HSTS, HTTP/3, Open Graph, Priority Hints, Prism, Snowplow Analytics, scrollreveal 4 tracked companies loaded by the homepage are not in Postmark's subprocessor list. A website can use a service without it processing customer data. ## Subprocessor of (149) Tracked vendors whose own subprocessor lists name it, and what they say they use it for. - [1Password](https://thirdpartyindex.com/vendors/1password.md): Customer support - [Abusix](https://thirdpartyindex.com/vendors/abusix.md): Delivery of transactional and notification emails.; Transactional email - [Aleph](https://thirdpartyindex.com/vendors/aleph.md): Email delivery - [Alguna](https://thirdpartyindex.com/vendors/alguna.md): Transactional email - [Alke Tech](https://thirdpartyindex.com/vendors/alke-tech.md) - [Altvia](https://thirdpartyindex.com/vendors/altvia.md): Email message delivery and mailing statistics - [Arrows](https://thirdpartyindex.com/vendors/arrows.md): Application email service; Sends transactional and notification emails from the application - [AspirePro](https://thirdpartyindex.com/vendors/aspirepro.md): Inbound email processing for email-to-ticket - [Attio](https://thirdpartyindex.com/vendors/attio.md): Email Delivery - [Balsamiq](https://thirdpartyindex.com/vendors/balsamiq.md): Transactional email delivery - [Binti](https://thirdpartyindex.com/vendors/binti.md): Email delivery; Email delivery service provider. - [Bird](https://thirdpartyindex.com/vendors/bird.md): Dashboard - Log management and Analysis software - [Blinq](https://thirdpartyindex.com/vendors/blinq.md) - [Blissbook](https://thirdpartyindex.com/vendors/blissbook.md): Transactional email - [BoldDesk](https://thirdpartyindex.com/vendors/bolddesk.md): Email Service Provider; Email to ticket inbound processor - [BoldSign](https://thirdpartyindex.com/vendors/boldsign.md): Email service provider; Sending transactional emails on behalf of the SaaS provider - [BrightLocal](https://thirdpartyindex.com/vendors/brightlocal.md): Email sending services - [BrowserStack](https://thirdpartyindex.com/vendors/browserstack.md): Email notifications for enterprise customers - [Buttondown](https://thirdpartyindex.com/vendors/buttondown.md): Email delivery and transactional email services - [Camino](https://thirdpartyindex.com/vendors/camino.md): Transactional email delivery — sends system notifications, onboarding emails, and task reminders - [Capacity](https://thirdpartyindex.com/vendors/capacity.md): Sends time-sensitive transactional emails and scheduling notifications for Capacity Scheduling, ensuring reliable delivery of workflow alerts.; Transactional em… - [Ceros](https://thirdpartyindex.com/vendors/ceros.md): Engineering; Relevant Customer Data: The name and email provided by a customer during Pilot acceptance. - [Chameleon Intelligent Tech](https://thirdpartyindex.com/vendors/chameleon-intelligent-tech.md): Communications and Personalization - [Chatra](https://thirdpartyindex.com/vendors/chatra.md): Email infrastructure - [Civic Roundtable](https://thirdpartyindex.com/vendors/civic-roundtable.md): Notifications; Sends emails. - [Clay](https://thirdpartyindex.com/vendors/clay.md): Email service provider - [ClientSuccess](https://thirdpartyindex.com/vendors/clientsuccess.md): Email Service Provider - [Cloutly](https://thirdpartyindex.com/vendors/cloutly.md): Transactional and campaign email delivery - [Clozd](https://thirdpartyindex.com/vendors/clozd.md): Email delivery services. \[ActiveCampaign Data Protection and Security Center\](; Required - [CoachAccountable](https://thirdpartyindex.com/vendors/coachaccountable.md): Email sending - [CodeSignal](https://thirdpartyindex.com/vendors/codesignal.md): Email Delivery; Email Delivery Service - [Concord](https://thirdpartyindex.com/vendors/concord.md): Transactional text message sender - [Contentsquare](https://thirdpartyindex.com/vendors/contentsquare.md): Email delivery service - [Conveyor](https://thirdpartyindex.com/vendors/conveyor.md): Email - [CookieChimp](https://thirdpartyindex.com/vendors/cookiechimp.md): Transactional email - [Credly by Pearson](https://thirdpartyindex.com/vendors/credly-by-pearson.md): Email services for the Motiva product; Used to send invitation emails to Learners - [CustomerOS](https://thirdpartyindex.com/vendors/customeros.md): Cloud email service - [DataForSEO](https://thirdpartyindex.com/vendors/dataforseo.md) - [DitchCarbon](https://thirdpartyindex.com/vendors/ditchcarbon.md): Transactional email - [Dock](https://thirdpartyindex.com/vendors/dock.md): Email delivery - [Dotfile](https://thirdpartyindex.com/vendors/dotfile.md): Engineering; Transactional email delivery - [Drata](https://thirdpartyindex.com/vendors/drata.md): \[Drata and SafeBase\] Postmark provides transactional email delivery services used to send system-generated emails from the platform and helps ensure reliable an… - [EasyLlama](https://thirdpartyindex.com/vendors/easyllama.md): Transactional messaging - [Edmentum](https://thirdpartyindex.com/vendors/edmentum.md): Email delivery - [Enchant](https://thirdpartyindex.com/vendors/enchant.md): Email Processing - [Eptura](https://thirdpartyindex.com/vendors/eptura.md): Transactional Email Management - [Ethos](https://thirdpartyindex.com/vendors/ethos.md): Transactional email delivery services - [Everapi](https://thirdpartyindex.com/vendors/everapi.md) - [EverTrue](https://thirdpartyindex.com/vendors/evertrue.md): Email service provider - [Fathom](https://thirdpartyindex.com/vendors/fathom.md): Email Provider - [Fathom Analytics](https://thirdpartyindex.com/vendors/fathom-analytics.md): Transactional email - [Feedbucket](https://thirdpartyindex.com/vendors/feedbucket.md): Transactional email delivery, where emails may contain Customer Personal Data - [Feedly Threat Intelligence](https://thirdpartyindex.com/vendors/feedly-threat-intelligence.md): Email Delivery - [Fillout](https://thirdpartyindex.com/vendors/fillout.md) - [FingerprintPro](https://thirdpartyindex.com/vendors/fingerprintpro.md) - [Formative](https://thirdpartyindex.com/vendors/formative.md): Email Notification Services - [Gamma](https://thirdpartyindex.com/vendors/gamma.md): Customer communications - [Gleap](https://thirdpartyindex.com/vendors/gleap.md): server location: USA. Transactional email delivery. - [Goldcast](https://thirdpartyindex.com/vendors/goldcast.md): Email delivery service, SMS Text messages - [GuestTix](https://thirdpartyindex.com/vendors/guesttix.md): Email delivery - [HackerRank](https://thirdpartyindex.com/vendors/hackerrank.md): Sending invite and confirmation emails to candidates for assessments and interviews - [Handhold](https://thirdpartyindex.com/vendors/handhold.md): Email delivery - [Heron](https://thirdpartyindex.com/vendors/heron.md) - [Hotjar](https://thirdpartyindex.com/vendors/hotjar.md): Email delivery service - [Humaans](https://thirdpartyindex.com/vendors/humaans.md): Transactional emails - [InEvent](https://thirdpartyindex.com/vendors/inevent.md): Email processing as part of a global email delivery network - [Infracost](https://thirdpartyindex.com/vendors/infracost.md): Product emails; Sending user emails - [Journeybee](https://thirdpartyindex.com/vendors/journeybee.md): Customer Service - [Kolide](https://thirdpartyindex.com/vendors/kolide.md): Customer support - [Kustomer](https://thirdpartyindex.com/vendors/kustomer.md): Email Channel; For the EMail Channel Integration + transactional emails - [Laravel](https://thirdpartyindex.com/vendors/laravel.md): Transactional email - [LEGALFLY](https://thirdpartyindex.com/vendors/legalfly.md): Email Delivery - [Linear](https://thirdpartyindex.com/vendors/linear.md): Email delivery - [LiquidPlanner](https://thirdpartyindex.com/vendors/liquidplanner.md): Service Notifications; Transactional email delivery for product notifications, reminders, and other email automation and tracking delivery metrics. - [LiveSession](https://thirdpartyindex.com/vendors/livesession.md): Email service provider - [Loadster](https://thirdpartyindex.com/vendors/loadster.md): Outbound Email - [Lucky Orange](https://thirdpartyindex.com/vendors/lucky-orange.md): Email Delivery - [Luma](https://thirdpartyindex.com/vendors/luma.md): Email delivery - [Master Inbox](https://thirdpartyindex.com/vendors/master-inbox.md): Transactional email delivery - [Matter](https://thirdpartyindex.com/vendors/matter.md): Service emails - [Medallia](https://thirdpartyindex.com/vendors/medallia.md): Provides email routing and delivery services. - [memoQ](https://thirdpartyindex.com/vendors/memoq.md): Customer Service - [Newsela](https://thirdpartyindex.com/vendors/newsela.md): Email Notification Services - [NoDataNoBusiness](https://thirdpartyindex.com/vendors/nodatanobusiness.md): Sends transactional emails such as account confirmations and notifications. - [One Horizon](https://thirdpartyindex.com/vendors/one-horizon.md): Sending transactional email - [Oneleet](https://thirdpartyindex.com/vendors/oneleet.md): Email Communications - [Paddle](https://thirdpartyindex.com/vendors/paddle.md): Email Service; Transactional email service - [Padlet](https://thirdpartyindex.com/vendors/padlet.md): Email Notification Services - [Paperform](https://thirdpartyindex.com/vendors/paperform.md): Processing period: April 5, 2024 - present Data disclosed: Submission data: information captured during the form submission process - [Patlytics](https://thirdpartyindex.com/vendors/patlytics.md): Engineering; Sends reliable, fast transactional email for applications (e.g., password resets, notifications). - [Perdoo](https://thirdpartyindex.com/vendors/perdoo.md) - [Picqer](https://thirdpartyindex.com/vendors/picqer.md): We use Postmark to send emails to your customers and suppliers from within Picqer. Postmark is operated by AC PM LLC, an ActiveCampaign company. - [Plain](https://thirdpartyindex.com/vendors/plain.md): Email Infrastructure; Email processing - [Portant](https://thirdpartyindex.com/vendors/portant.md): Transactional email delivery - [Postcall](https://thirdpartyindex.com/vendors/postcall.md) - [PowerSchool](https://thirdpartyindex.com/vendors/powerschool.md): Email Communications - [Product Fruits](https://thirdpartyindex.com/vendors/product-fruits.md): Emailing; Emailing in connection with services (e.g., when you create account for your employee) - [Productlane](https://thirdpartyindex.com/vendors/productlane.md): Outbound email delivery for customer inboxes - [PromoteKit](https://thirdpartyindex.com/vendors/promotekit.md): transactional email and notification delivery. - [PropelAuth](https://thirdpartyindex.com/vendors/propelauth.md): Email management - [Proposales](https://thirdpartyindex.com/vendors/proposales.md) - [Proposify](https://thirdpartyindex.com/vendors/proposify.md): Cloud-based Email Notification Services - [ProsperStack](https://thirdpartyindex.com/vendors/prosperstack.md): Transactional email - [Pylon](https://thirdpartyindex.com/vendors/pylon.md): Email - [Quaderno](https://thirdpartyindex.com/vendors/quaderno.md): Email delivery service - [Railway](https://thirdpartyindex.com/vendors/railway.md): Email Processing - [Remind1](https://thirdpartyindex.com/vendors/remind1.md): Email delivery - [Replicated](https://thirdpartyindex.com/vendors/replicated.md): Transactional emails from Vendor Portal. Marketing related communications. - [Responsly](https://thirdpartyindex.com/vendors/responsly.md): Email delivery, including survey invitations - [Rewardful](https://thirdpartyindex.com/vendors/rewardful.md): Engineering; Postmark is a cloud platform offering transactional email delivery, tracking, and management tools to help businesses communicate efficiently and r… - [RingCentral](https://thirdpartyindex.com/vendors/ringcentral.md): Email delivery - [Rootstuff](https://thirdpartyindex.com/vendors/rootstuff.md): Transactional and alert email delivery. - [RWX](https://thirdpartyindex.com/vendors/rwx.md): Transactional email delivery - [SatisMeter](https://thirdpartyindex.com/vendors/satismeter.md) - [ScreenSteps](https://thirdpartyindex.com/vendors/screensteps.md): Email notification services; Engineering - [Secure Privacy](https://thirdpartyindex.com/vendors/secure-privacy.md): Email administration and sending service - [Segment](https://thirdpartyindex.com/vendors/segment.md): Postmark Routes, transmits, and delivers of outbound email communications for specific Twilio Products and Services - [Seline](https://thirdpartyindex.com/vendors/seline.md): Transactional email - [SendGrid](https://thirdpartyindex.com/vendors/sendgrid.md): Postmark Routes, transmits, and delivers of outbound email communications for specific Twilio Products and Services - [SerpApi](https://thirdpartyindex.com/vendors/serpapi.md): email delivery - [Session Rewind](https://thirdpartyindex.com/vendors/session-rewind.md): Automated platform email notifications - [Sessionize](https://thirdpartyindex.com/vendors/sessionize.md): Postmark handles the delivery of email messages from our system to organizers and speakers. - [SightCall](https://thirdpartyindex.com/vendors/sightcall.md): Email Sending - [SimpleDocs](https://thirdpartyindex.com/vendors/simpledocs.md): e-mail delivery service - [Skio](https://thirdpartyindex.com/vendors/skio.md): In-service communications - [sparkpost](https://thirdpartyindex.com/vendors/sparkpost.md): Dashboard - Log management and Analysis software - [Sprout Social](https://thirdpartyindex.com/vendors/sprout-social.md) - [Steady](https://thirdpartyindex.com/vendors/steady.md): transactional email delivery - [Supabase](https://thirdpartyindex.com/vendors/supabase.md): Communication with Authorized Users in connection with the provision of the Services and support - [Supademo](https://thirdpartyindex.com/vendors/supademo.md): Transactional email delivery - [Superthread](https://thirdpartyindex.com/vendors/superthread.md): Email sending - [Syncfusion](https://thirdpartyindex.com/vendors/syncfusion.md): Email Service Provider; Sending transactional emails - [SynergyOS](https://thirdpartyindex.com/vendors/synergyos.md): Email notification provider - [Tackle.io](https://thirdpartyindex.com/vendors/tackle-io.md): Customer Email and Marketing - [Tellent Recruitee](https://thirdpartyindex.com/vendors/tellent-recruitee.md): Email Delivery Platform - [Text](https://thirdpartyindex.com/vendors/text.md): Email services through the Postmark product; Marketing - [TribeMap](https://thirdpartyindex.com/vendors/tribemap.md): Transactional and report email - [Tropic](https://thirdpartyindex.com/vendors/tropicapp-io.md): Email service provider - [Tuple](https://thirdpartyindex.com/vendors/tuple.md): Transactional application email - [Twilio](https://thirdpartyindex.com/vendors/twilio.md): Postmark Routes, transmits, and delivers of outbound email communications for specific Twilio Products and Services - [Ubicloud](https://thirdpartyindex.com/vendors/ubicloud.md): Email delivery platform - [UpGuard](https://thirdpartyindex.com/vendors/upguard.md): Email delivery service - [Urlbox](https://thirdpartyindex.com/vendors/urlbox.md) - [User Interviews](https://thirdpartyindex.com/vendors/user-interviews.md): Sends transactional emails to Researchers and Participants - [Userflow](https://thirdpartyindex.com/vendors/userflow.md) - [Veritonic](https://thirdpartyindex.com/vendors/veritonic.md) - [WorkOS](https://thirdpartyindex.com/vendors/workos.md): Core Product; Email Delivery - [Zeplin](https://thirdpartyindex.com/vendors/zeplin.md): Zeplin uses Postmark to provide email services, for transactional emails and for service notifications. Postmark infrastructure processes some Zeplin email traf… - [ZITADEL](https://thirdpartyindex.com/vendors/zitadel.md): We use Postmark to send transactional mails to clients. Your data might be processed by Postmark when using our services, especially when you have not configure… ## Service status Incidents it reported on its own status page. - Last 90 days: 10 reported incidents (0 major or critical, 0 minor, 10 with no impact stated) - Typical time to resolve: 3 h 32 min - Status page last read: 2026-11-12 - 2026-11-05: Delays in activity data (no impact stated) - 2026-11-04: Delays processing Inbound messages (no impact stated) - 2026-10-27: SMS codes for two-factor authentication may not arrive (no impact stated) - 2026-09-28: Delayed Inbound Message Processing (no impact stated) - 2026-09-28: Delayed Message Delivery (no impact stated) - 2026-09-22: Delayed Message Delivery (no impact stated) - 2026-09-17: Web-App Page Loading Issues (no impact stated) - 2026-08-24: Delays in Stats Data (no impact stated) The subprocessor list as we read it on any date: https://thirdpartyindex.com/labs/time-machine/postmark --- Third Party Index (https://thirdpartyindex.com) monitors vendors' public security and privacy documents and keeps each version as evidence. Data CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/); vendors' own documents are theirs. API: https://thirdpartyindex.com/api