{ "name": "Postmark", "slug": "postmark", "website_url": "https://postmarkapp.com", "vendor_description": "Fast, Reliable Email Delivery Service", "categories": [ "email" ], "summary": "Postmark is a transactional email service focused on fast, reliable delivery for notifications, password resets, and receipts. The REST API uses API-key auth, webhooks, seven SDKs, and an official MCP server. Pricing is published and self-serve: 100 emails/month free, paid plans from $15/month. It is GDPR compliant. Used by Asana, IKEA, and UNICEF.", "capabilities": { "supported_actions": [ "send_email", "send_batch_emails", "send_bulk_emails", "get_bulk_email_status", "get_delivery_stats", "get_bounces", "get_bounce", "get_bounce_dump", "activate_bounce", "send_email_with_template", "send_batch_with_template", "push_templates_to_another_server", "get_template", "create_template", "edit_template", "list_templates", "delete_template", "validate_template", "get_server", "create_server", "edit_server", "list_servers", "delete_server", "list_message_streams", "get_message_stream", "edit_message_stream", "create_message_stream", "archive_message_stream", "unarchive_message_stream", "search_outbound_messages", "get_outbound_message_details", "get_outbound_message_dump", "search_inbound_messages", "get_inbound_message_details", "bypass_rules_for_blocked_inbound_message", "retry_failed_inbound_message", "get_message_opens", "get_opens_for_single_message", "get_message_clicks", "get_clicks_for_single_message", "list_domains", "get_domain", "create_domain", "edit_domain", "delete_domain", "verify_dkim", "verify_return_path", "verify_spf", "rotate_dkim_keys", "list_sender_signatures", "get_sender_signature", "create_sender_signature", "edit_sender_signature", "delete_sender_signature", "resend_signature_confirmation", "verify_spf_for_signature", "request_new_dkim_for_signature", "get_outbound_overview_stats", "get_sent_counts", "get_bounce_counts", "get_spam_complaints", "get_tracked_email_counts", "get_email_open_counts", "get_email_platform_usage", "get_email_client_usage", "get_click_counts", "get_browser_usage", "get_browser_platform_usage", "get_click_location", "list_inbound_rule_triggers", "create_inbound_rule_trigger", "delete_inbound_rule_trigger", "list_webhooks", "get_webhook", "create_webhook", "edit_webhook", "delete_webhook", "get_suppression_dump", "create_suppression", "delete_suppression", "create_data_removal_request", "check_data_removal_request_status" ], "supported_regions": [], "supported_languages": [], "input_types": [ "JSON" ], "output_types": [ "JSON" ], "webhooks_supported": true, "sandbox_available": true, "sdk_languages": [ "Python", "Node.js", "PHP", ".NET", "Ruby", "Rails", "Java" ], "mcp_server_available": true }, "integration": { "api_style": "rest", "base_url": "https://api.postmarkapp.com", "api_version": null, "versioning_scheme": "none", "stability": "ga", "deprecation_policy_url": null, "auth_methods": [ "api_key" ], "auth_docs_url": "https://postmarkapp.com/developer/api/overview", "idempotency_supported": false, "error_format": "vendor-specific", "webhook_signing": null, "webhook_events_url": "https://postmarkapp.com/developer/webhooks/webhooks-overview", "rate_limit_requests": null, "rate_limit_window": null, "sdk_packages": [ { "stars": 12, "package": "postmark-python (PyPI)", "archived": false, "language": "Python", "official": true, "repo_url": "https://github.com/ActiveCampaign/postmark-python", "last_pushed_at": "2026-06-04T18:38:31Z" }, { "stars": 358, "package": "postmark (npm)", "archived": false, "language": "Node.js", "official": true, "repo_url": "https://github.com/ActiveCampaign/postmark.js", "last_pushed_at": "2026-05-08T04:49:55Z" }, { "stars": 176, "package": "wildbit/postmark-php (Composer)", "archived": false, "language": "PHP", "official": true, "repo_url": "https://github.com/ActiveCampaign/postmark-php", "last_pushed_at": "2026-01-22T20:35:01Z" }, { "stars": 54, "package": "Postmark (NuGet)", "archived": false, "language": ".NET", "official": true, "repo_url": "https://github.com/ActiveCampaign/postmark-dotnet", "last_pushed_at": "2026-01-12T18:13:44Z" }, { "stars": 228, "package": "postmark (RubyGems)", "archived": false, "language": "Ruby", "official": true, "repo_url": "https://github.com/ActiveCampaign/postmark-gem", "last_pushed_at": "2024-07-31T14:22:45Z" }, { "stars": 394, "package": "postmark-rails (RubyGems)", "archived": false, "language": "Rails", "official": true, "repo_url": "https://github.com/ActiveCampaign/postmark-rails", "last_pushed_at": "2024-09-20T13:34:41Z" }, { "stars": 43, "package": "com.postmarkapp:postmark (Maven)", "archived": false, "language": "Java", "official": true, "repo_url": "https://github.com/ActiveCampaign/postmark-java", "last_pushed_at": "2026-03-02T00:36:59Z" } ], "mcp_url": "https://github.com/ActiveCampaign/postmark-mcp", "quickstart_url": "https://postmarkapp.com/developer/user-guide/send-email-with-api" }, "pricing": { "pricing_model": "hybrid", "has_published_pricing": true, "starting_price_usd": "15.0000", "price_basis": "month", "free_tier_available": true, "free_tier_limit": "100 emails/month", "free_tier_details": "100 emails/month, never expires or runs out", "minimum_commitment": null, "self_serve_signup": true, "requires_sales_call": false, "requires_verification": true, "enterprise_plan_available": true, "price_points": [ { "plan": "Free", "item": "100 emails", "amount_usd": "0.0000", "amount_percent": null, "per": "month", "currency": "USD", "source_url": "https://postmarkapp.com/pricing" }, { "plan": "Basic", "item": "10,000 emails", "amount_usd": "15.0000", "amount_percent": null, "per": "month", "currency": "USD", "source_url": "https://postmarkapp.com/pricing" }, { "plan": "Basic", "item": "extra emails", "amount_usd": "1.8000", "amount_percent": null, "per": "1,000 emails", "currency": "USD", "source_url": "https://postmarkapp.com/pricing" }, { "plan": "Pro", "item": "10,000 emails", "amount_usd": "16.5000", "amount_percent": null, "per": "month", "currency": "USD", "source_url": "https://postmarkapp.com/pricing" }, { "plan": "Pro", "item": "extra emails", "amount_usd": "1.3000", "amount_percent": null, "per": "1,000 emails", "currency": "USD", "source_url": "https://postmarkapp.com/pricing" }, { "plan": "Platform", "item": "10,000 emails", "amount_usd": "18.0000", "amount_percent": null, "per": "month", "currency": "USD", "source_url": "https://postmarkapp.com/pricing" }, { "plan": "Platform", "item": "extra emails", "amount_usd": "1.2000", "amount_percent": null, "per": "1,000 emails", "currency": "USD", "source_url": "https://postmarkapp.com/pricing" }, { "plan": null, "item": "Dedicated IP", "amount_usd": "50.0000", "amount_percent": null, "per": "month", "currency": "USD", "source_url": "https://postmarkapp.com/pricing" }, { "plan": null, "item": "Custom activity retention", "amount_usd": "5.0000", "amount_percent": null, "per": "month", "currency": "USD", "source_url": "https://postmarkapp.com/pricing" }, { "plan": null, "item": "DMARC monitoring", "amount_usd": "14.0000", "amount_percent": null, "per": "month", "currency": "USD", "source_url": "https://postmarkapp.com/pricing" } ] }, "compliance": { "soc2": "none", "hipaa": null, "gdpr": true, "iso_27001": null, "pci_dss": false, "sla_published": false, "sla_url": null, "data_retention_policy_url": "https://postmarkapp.com/support/article/how-long-are-inbound-and-outbound-messages-stored-in-activity", "documented_rate_limits": "No specific numeric rate limits published for the Email API (429 error code exists); SMTP recommended: \"10 concurrent connections per IP\"; Status API: \"10 requests per second\"", "known_restrictions": [ "10 MB payload size for the standard Email API; 50 MB total for the Batch Email API", "Maximum of 500 messages per batch request", "Maximum of 100 templates per Server", "Maximum of 10 message streams per Server", "Only one inbound stream allowed per Server", "Cannot send to recipients marked 'inactive' due to hard bounces or complaints", "Public domains cannot be used for Sender Signatures", "Spam complaint rate must be lower than 0.1% (1 in 1,000 emails)", "Bounce rate must be lower than 10% of all emails sent", "Webhook URL cannot contain internal IP ranges" ] }, "developer": { "docs_url": "https://developer.postmarkapp.com", "api_reference_url": null, "openapi_spec_url": null, "postman_collection_url": null, "changelog_url": null, "status_page_url": "https://status.postmarkapp.com", "llms_txt_url": "https://postmarkapp.com/llms.txt", "markdown_docs_url": null }, "adoption": { "launched_at": "2009-01-01", "ga_date": null, "github_stars": null, "github_stars_at": null, "notable_customers": [ "LiveChat", "Asana", "IKEA", "UNICEF", "1Password", "Paddle", "Webflow", "InVision", "Wistia", "Betterment", "Moz", "VSCO", "Mastodon", "Mojang", "Litmus", "Livestream", "Desk" ] }, "scores": { "agent_friendliness": null, "pricing_transparency": null, "setup_speed": null, "docs_quality": null, "procurement_friction": null, "trust_readiness": null, "best_for": [], "avoid_if": [] }, "sources": [ { "field": "webhooks_supported", "url": "https://postmarkapp.com/developer/api/webhooks-api", "excerpt": "Webhooks API lets you manage webhooks for a specific Transactional or Broadcast Message Stream.", "confidence": "high" }, { "field": "free_tier_available", "url": "https://account.postmarkapp.com/sign_up", "excerpt": "Sign up for Postmark in 30 seconds and get your first 100 emails for free.", "confidence": "high" }, { "field": "supported_regions", "url": "https://postmarkapp.com/eu-privacy", "excerpt": "The data centers we use demonstrate ongoing compliance with rigorous international standar", "confidence": "medium" }, { "field": "supported_regions", "url": "https://postmarkapp.com/blog/how-we-moved-postmark-to-aws", "excerpt": "We were able to achieve a seamless move from our colocated data center to AWS", "confidence": "medium" }, { "field": "known_restrictions", "url": "https://postmarkapp.com/developer", "excerpt": "API reference. Get straight to the details of every HTTP request available through Postmark's REST API.", "confidence": "medium" }, { "field": "gdpr", "url": "https://postmarkapp.com/support/article/1218-gdpr-faq", "excerpt": "The data centers we use demonstrate ongoing compliance with rigorous international standards, such as ISO 27017 for cloud", "confidence": "high" }, { "field": "gdpr", "url": "https://postmarkapp.com/dpa", "excerpt": "We host our servers in highly secure, SOC 2 certified data centers and use the latest security practices to protect our customers' data.", "confidence": "high" }, { "field": "primary_use_cases", "url": "https://postmarkapp.com/", "excerpt": "Our API and SMTP service help you send your emails with ease, whether that's password reset emails, notifications, newsletters, or anything in between.", "confidence": "high" }, { "field": "supported_actions", "url": "https://postmarkapp.com/developer/api/email-api", "excerpt": "This endpoint is solely responsible for sending emails with Postmark through a specific server. Please note that the batch endpoint accepts up to 500 messages", "confidence": "medium" }, { "field": "categories", "url": "https://postmarkapp.com/", "excerpt": "Our API and SMTP service help you send your emails with ease", "confidence": "high" }, { "field": "supported_languages", "url": "https://postmarkapp.com/developer", "excerpt": "API reference. Get straight to the details of every HTTP request available through Postmark's REST API.", "confidence": "high" }, { "field": "soc2", "url": "https://postmarkapp.com/support/article/is-postmark-secure-and-redundant", "excerpt": "A DuPont Fabros facility, the Deft data center is SOC 2 Type 2 accredited and includes keycard protocols, biometric scanning protocols", "confidence": "medium" }, { "field": "mcp_server_available", "url": "https://postmarkapp.com/lp/mcp", "excerpt": "Postmark's MCP Server allows AI tools like Claude Desktop and Cursor to securely access and manage your Postmark emails through natural language commands.", "confidence": "high" }, { "field": "pci_dss", "url": "https://postmarkapp.com/security", "excerpt": "We host our servers in a secure data center and use the latest security practices. Postmark gives you detailed user permissions so you certified as a PCI Level", "confidence": "medium" }, { "field": "pricing_model", "url": "https://postmarkapp.com/pricing", "excerpt": "Free. $0.00 · Test your integration with 100 emails/month ; Basic. $15.00 · For solo developers and smaller teams ; Pro. $16.50 · For start-ups and small businesses.", "confidence": "high" }, { "field": "soc2", "url": "https://postmarkapp.com/eu-privacy", "excerpt": "The data centers we use demonstrate ongoing compliance with rigorous international standards, such. SOC 1, SOC 2, and SOC", "confidence": "medium" }, { "field": "mcp_server_available", "url": "https://postmarkapp.com/updates/postmark-labs-new-mcp-server-for-ai-powered-email", "excerpt": "The MCP server exposes four core Postmark capabilities as tools that AI assistants can use directly: Send emails - Single transactional emails", "confidence": "high" }, { "field": "pci_dss", "url": "https://postmarkapp.com/eu-privacy", "excerpt": "The data centers we use demonstrate ongoing compliance with rigorous international standards, such. SOC 1, SOC 2, and SOC 3, PCI DSS Level 1, and mor", "confidence": "medium" }, { "field": "pricing_model", "url": "https://postmarkapp.com/support/article/1107-how-does-monthly-pricing-work", "excerpt": "Dedicated IPs: Starts at $50/month per IP. Our fully managed dedicated IPs are available to customers sending 300,000 emails per month or more.", "confidence": "high" }, { "field": "pricing_model", "url": "https://www.buildmvpfast.com/api-costs/email", "excerpt": "Best deliverability: Postmark ($15/mo + $1.80 per 1K extra)", "confidence": "high" }, { "field": "has_published_pricing", "url": "https://postmarkapp.com/pricing", "excerpt": "Free. $0.00 · Test your integration with 100 emails/month ; Basic. $15.00 · For solo developers and smaller teams ; Pro. $16.50 · For start-ups and small businesses.", "confidence": "high" }, { "field": "requires_sales_call", "url": "https://account.postmarkapp.com/sign_up", "excerpt": "Sign up for Postmark in 30 seconds and get your first 100 emails for free.", "confidence": "high" }, { "field": "enterprise_plan_available", "url": "https://postmarkapp.com/support/article/1107-how-does-monthly-pricing-work", "excerpt": "Dedicated IPs: Starts at $50/month per IP. Our fully managed dedicated IPs are available to customers sending 300,000 emails per month or more.", "confidence": "medium" }, { "field": "input_types", "url": "https://postmarkapp.com/developer/user-guide/send-email-with-api", "excerpt": "Sending single emails through Postmark is as simple as sending an HTTP POST request to our /email endpoint with the JSON message attached to the body.", "confidence": "high" }, { "field": "sandbox_available", "url": "https://postmarkapp.com/developer/user-guide/sandbox-mode", "excerpt": "Sandbox mode allows you to safely test out different parts of Postmark without accidentally sending email to real recipients.", "confidence": "high" }, { "field": "sandbox_available", "url": "https://postmarkapp.com/blog/new-in-postmark-sandbox-mode", "excerpt": "Here's a safe space for you to experiment with Postmark—without the risk of accidentally sending test mail to real customers.", "confidence": "high" }, { "field": "documented_rate_limits", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": "429 — Rate Limit Exceeded We have detected that you are making requests at a rate that exceeds acceptable use of the API. You should reduce the rate at", "confidence": "medium" }, { "field": "documented_rate_limits", "url": "https://status.postmarkapp.com/api", "excerpt": "rate limiting to 10 requests per second", "confidence": "medium" }, { "field": "output_types", "url": "https://postmarkapp.com/developer", "excerpt": "API reference. Get straight to the details of every HTTP request available through Postmark's REST API.", "confidence": "high" }, { "field": "sdk_languages", "url": "https://postmarkapp.com/developer", "excerpt": "API reference. Get straight to the details of every HTTP request available through Postmark's REST API.", "confidence": "medium" }, { "field": "free_tier_details", "url": "https://account.postmarkapp.com/sign_up", "excerpt": "Sign up for Postmark in 30 seconds and get your first 100 emails for free.", "confidence": "high" }, { "field": "sla_published", "url": "https://postmarkapp.com/terms-of-service", "excerpt": "These Terms of Service are for new customers effective immediately as of December 10, 2024.", "confidence": "medium" }, { "field": "iso_27001", "url": "https://postmarkapp.com/eu-privacy", "excerpt": "The data centers we use demonstrate ongoing compliance with rigorous international standards, such. SOC 1, SOC 2, and SOC 3, PCI DSS Level 1, and mor", "confidence": "medium" }, { "field": "webhooks_supported", "url": "https://postmarkapp.com/developer/webhooks/webhooks-overview", "excerpt": "A webhook is the act of Postmark making an HTTP POST request to your application's API when an event occurs.", "confidence": "high" }, { "field": "free_tier_available", "url": "https://postmarkapp.com/pricing", "excerpt": "Free. $0.00 · Test your integration with 100 emails/month", "confidence": "high" }, { "field": "minimum_commitment", "url": "https://postmarkapp.com/pricing", "excerpt": "Free. $0.00 · Test your integration with 100 emails/month ; Basic. $15.00 · For solo developers and smaller teams ; Pro. $16.50 · For start-ups and small businesses.", "confidence": "medium" }, { "field": "supported_regions", "url": "https://postmarkapp.com/email-delivery", "excerpt": "We have redundant data centers in multiple locations around the world ensuring you never lose an email.", "confidence": "medium" }, { "field": "known_restrictions", "url": "https://postmarkapp.com/developer/api/email-api", "excerpt": "This endpoint is solely responsible for sending emails with Postmark through a specific server. Please note that the batch endpoint accepts up to 500 messages", "confidence": "medium" }, { "field": "self_serve_signup", "url": "https://account.postmarkapp.com/sign_up", "excerpt": "Sign up for Postmark in 30 seconds and get your first 100 emails for free.", "confidence": "high" }, { "field": "gdpr", "url": "https://postmarkapp.com/eu-privacy", "excerpt": "The data centers we use demonstrate ongoing compliance with rigorous international standar", "confidence": "high" }, { "field": "website_url", "url": "https://postmarkapp.com/", "excerpt": "Our API and SMTP service help you send your emails with ease", "confidence": "high" }, { "field": "supported_actions", "url": "https://postmarkapp.com/developer", "excerpt": "API reference. Get straight to the details of every HTTP request available through Postmark's REST API. Overview → · Email API → · Bulk Email → · Bounce API →", "confidence": "medium" }, { "field": "supported_actions", "url": "https://postmarkapp.com/api-explorer", "excerpt": "Use our API Explorer to send API requests directly to your Postmark server or account. Server API; Account API.", "confidence": "medium" }, { "field": "hipaa", "url": "https://postmarkapp.com/security", "excerpt": "We host our servers in a secure data center and use the latest security practices.", "confidence": "medium" }, { "field": "soc2", "url": "https://postmarkapp.com/dpa", "excerpt": "We host our servers in highly secure, SOC 2 certified data centers and use the latest security practices to protect our customers' data.", "confidence": "medium" }, { "field": "documented_rate_limits", "url": "https://postmarkapp.com/support/article/do-we-have-rate-limits-for-smtp", "excerpt": "We recommend that customers limit the total number of connections to our SMTP endpoint to 10 concurrent connections, per IP.", "confidence": "medium" }, { "field": "vendor_description", "url": "https://postmarkapp.com/", "excerpt": null, "confidence": "high" }, { "field": "output_types", "url": "https://postmarkapp.com/developer/user-guide/send-email-with-api", "excerpt": "Sending single emails through Postmark is as simple as sending an HTTP POST request to our /email endpoint with the JSON message attached to the body.", "confidence": "high" }, { "field": "free_tier_details", "url": "https://postmarkapp.com/pricing", "excerpt": "Free. $0.00 · Test your integration with 100 emails/month", "confidence": "high" }, { "field": "name", "url": "https://postmarkapp.com/", "excerpt": null, "confidence": "high" }, { "field": "iso_27001", "url": "https://postmarkapp.com/support/article/1218-gdpr-faq", "excerpt": "The data centers we use demonstrate ongoing compliance with rigorous international standards, such as ISO 27017 for cloud", "confidence": "medium" }, { "field": "webhooks_supported", "url": "https://postmarkapp.com/email-webhooks", "excerpt": "Postmark's webhooks notify your application about key message events such as bounces, deliveries, opens, clicks, and spam complaints.", "confidence": "high" }, { "field": "webhook_events_url", "url": "https://postmarkapp.com/developer/webhooks/webhooks-overview", "excerpt": "A webhook is the act of Postmark making an HTTP POST request to your application's API when an event occurs. This way Postmark is able to immediately", "confidence": "high" }, { "field": "base_url", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": "The Postmark API is built on REST principles. Authenticated users can interact with any of our URIs by using the specified HTTP request method.", "confidence": "high" }, { "field": "base_url", "url": "https://postmarkapp.com/developer/api/email-api", "excerpt": "This endpoint is solely responsible for sending emails with Postmark through a specific server. Please note that the batch endpoint accepts up to 500 messages", "confidence": "high" }, { "field": "free_tier_limit", "url": "https://postmarkapp.com/pricing", "excerpt": "Trial Basic $15.00/mo For solo developers and smaller teams Starting at 10,000 emails/month. includes 100 emails every month.", "confidence": "high" }, { "field": "free_tier_limit", "url": "https://postmarkapp.com/support/article/1002-getting-started-with-postmark", "excerpt": "The signup is simple and our free developer plan includes 100 test emails per", "confidence": "high" }, { "field": "fields_not_found", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": null, "confidence": "medium" }, { "field": "rate_limit_window", "url": "https://postmarkapp.com/support/article/do-we-have-rate-limits-for-smtp", "excerpt": "SMTP rate-limiting allows. We recommend that customers limit the total number of connections to our SMTP endpoint to 10 concurrent connections, per IP.", "confidence": "medium" }, { "field": "rate_limit_window", "url": "https://status.postmarkapp.com/api", "excerpt": "rate limiting to 10 requests per second.", "confidence": "medium" }, { "field": "starting_price_usd", "url": "https://postmarkapp.com/pricing", "excerpt": "Trial Basic $15.00/mo For solo developers and smaller teams Starting at 10,000 emails/month.", "confidence": "high" }, { "field": "versioning_scheme", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": "The Postmark API is built on REST principles. Authenticated users can interact with any of our URIs by using the specified HTTP request method.", "confidence": "high" }, { "field": "versioning_scheme", "url": "https://postmarkapp.com/developer/api/email-api", "excerpt": "This endpoint is solely responsible for sending emails with Postmark through a specific server.", "confidence": "high" }, { "field": "auth_docs_url", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": "The Postmark API is built on REST principles. Authenticated users can interact with any of our URIs by using the specified HTTP request method.", "confidence": "high" }, { "field": "auth_docs_url", "url": "https://postmarkapp.com/developer/user-guide/send-email-with-api", "excerpt": "In order to authenticate yourself to the service, you need to use the X-Postmark-Server-Token header for authentication and authorization. Each Postmark server", "confidence": "high" }, { "field": "price_basis", "url": "https://postmarkapp.com/pricing", "excerpt": "Trial Basic $15.00/mo For solo developers and smaller teams Starting at 10,000 emails/month.", "confidence": "high" }, { "field": "requires_verification", "url": "https://postmarkapp.com/support/article/adding-sender-signatures", "excerpt": "We use Sender Signatures and Domain Verification to ensure you own the mailboxes you want to send from, as this helps prevent spam and abuse.", "confidence": "high" }, { "field": "requires_verification", "url": "https://postmarkapp.com/developer/user-guide/managing-your-account/managing-sender-signatures", "excerpt": "We recommend you verify the domain since authenticating is the fastest path to ensuring email deliverability.", "confidence": "high" }, { "field": "requires_verification", "url": "https://postmarkapp.com/blog/feature-announcement-domain-verification", "excerpt": "With Domain Verification you won't have to verify a new Sender Signature for each email address you want to send from. Every email address on a", "confidence": "high" }, { "field": "api_style", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": "The Postmark API is built on REST principles. Authenticated users can interact with any of our URIs by using the specified HTTP request method.", "confidence": "high" }, { "field": "idempotency_supported", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": null, "confidence": "medium" }, { "field": "idempotency_supported", "url": "https://postmarkapp.com/developer/api/email-api", "excerpt": "This endpoint is solely responsible for sending emails with Postmark through a specific server. Please note that the batch endpoint accepts up to 500 messages", "confidence": "medium" }, { "field": "notable_customers", "url": "https://postmarkapp.com/customers/livechat", "excerpt": "Postmark has been a valuable email solution that helped us easily scale the business up to 10,000 customers. Reports and email details have been a great tool", "confidence": "medium" }, { "field": "notable_customers", "url": "https://postmarkapp.com/customers", "excerpt": "This is where you can read about the experience of Postmark customers and learn how Postmark makes delivering email simple.", "confidence": "medium" }, { "field": "mcp_url", "url": "https://github.com/ActiveCampaign", "excerpt": "postmark-mcp Public. Experimental MCP server for Postmark, built by Postmark Labs. Designed for tinkering, testing, and teleporting transactional email into", "confidence": "high" }, { "field": "mcp_url", "url": "https://postmarkapp.com/lp/mcp", "excerpt": "Postmark's MCP Server allows AI tools like Claude Desktop and Cursor to securely access and manage your Postmark emails through natural language commands.", "confidence": "high" }, { "field": "ga_date", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": null, "confidence": "medium" }, { "field": "stability", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": "The Postmark API is built on REST principles. Authenticated users can interact with any of our URIs by using the specified HTTP request method.", "confidence": "high" }, { "field": "data_retention_policy_url", "url": "https://postmarkapp.com/support/article/how-long-are-inbound-and-outbound-messages-stored-in-activity", "excerpt": "Postmark stores blocked inbound messages for your Retention period - which is 45 days by default. The retention time can be customized from 7 to", "confidence": "high" }, { "field": "rate_limit_requests", "url": "https://postmarkapp.com/support/article/do-we-have-rate-limits-for-smtp", "excerpt": "SMTP rate-limiting allows. We recommend that customers limit the total number of connections to our SMTP endpoint to 10 concurrent connections, per IP.", "confidence": "medium" }, { "field": "rate_limit_requests", "url": "https://status.postmarkapp.com/api", "excerpt": "rate limiting to 10 requests per second.", "confidence": "medium" }, { "field": "deprecation_policy_url", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": null, "confidence": "medium" }, { "field": "deprecation_policy_url", "url": "https://postmarkapp.com/support/article/1086-heroku-deprecation-faq", "excerpt": "On June 30th, 2017, Postmark's Heroku add-on integration will be deprecated and no longer available for use.", "confidence": "medium" }, { "field": "quickstart_url", "url": "https://postmarkapp.com/developer/user-guide/send-email-with-api", "excerpt": "In order to authenticate yourself to the service, you need to use the X-Postmark-Server-Token header for authentication and authorization. Each Postmark server", "confidence": "high" }, { "field": "auth_methods", "url": "https://postmarkapp.com/developer/user-guide/send-email-with-api", "excerpt": "In order to authenticate yourself to the service, you need to use the X-Postmark-Server-Token header for authentication and authorization. Each Postmark server", "confidence": "high" }, { "field": "auth_methods", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": "The Postmark API is built on REST principles. Authenticated users can interact with any of our URIs by using the specified HTTP request method.", "confidence": "high" }, { "field": "api_version", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": "The Postmark API is built on REST principles. Authenticated users can interact with any of our URIs by using the specified HTTP request method.", "confidence": "high" }, { "field": "sdk_packages", "url": "https://postmarkapp.com/developer/integration/official-libraries", "excerpt": "Get information about the official Postmark API client libraries for Rails, Ruby, .Net, PHP, Node.js, Wordpress, and Grunt.", "confidence": "high" }, { "field": "sdk_packages", "url": "https://github.com/ActiveCampaign", "excerpt": "postmark-mcp Public. Experimental MCP server for Postmark, built by Postmark Labs.", "confidence": "high" }, { "field": "sdk_packages", "url": "https://github.com/ActiveCampaign/postmark-python", "excerpt": "The official (Beta) Python SDK for Postmark — send emails, manage bounces, templates, webhooks, and more.", "confidence": "high" }, { "field": "sdk_packages", "url": "https://github.com/ActiveCampaign/postmark.js/", "excerpt": "Postmark allows you to send your application's emails with high delivery rates, including bounce/spam processing and detailed statistics.", "confidence": "high" }, { "field": "sdk_packages", "url": "https://github.com/ActiveCampaign/postmark-php", "excerpt": null, "confidence": "high" }, { "field": "error_format", "url": "https://postmarkapp.com/developer/api/overview", "excerpt": "The Postmark API is built on REST principles. Authenticated users can interact with any of our URIs by using the specified HTTP request method.", "confidence": "medium" }, { "field": "sla_url", "url": "https://status.postmarkapp.com/", "excerpt": "We are experiencing email sending delays due to degraded system performance. Mail is still being accepted into the system. API SMTP · View notice →.", "confidence": "medium" }, { "field": "sla_url", "url": "https://postmarkapp.com/security", "excerpt": "Committed to keeping your data safe and secure. We host our servers in a secure data center and use the latest security practices to protect our customer's data", "confidence": "medium" }, { "field": "launched_at", "url": "https://foundersib.com/2022/05/09/founders-advises-wildbit-in-its-sale-of-postmark-and-dmarc-digests-to-activecampaign/", "excerpt": "Initially launched in 2009, Postmark is a best-in-class transactional email delivery platform servicing thousands of customers globally.", "confidence": "medium" }, { "field": "webhook_signing", "url": "https://postmarkapp.com/developer/webhooks/webhooks-overview", "excerpt": "A webhook is the act of Postmark making an HTTP POST request to your application's API when an event occurs. This way Postmark is able to immediately", "confidence": "medium" }, { "field": "webhook_signing", "url": "https://postmarkapp.com/updates", "excerpt": "IP allowlisting for our API will no longer be supported starting August 23, 2023.", "confidence": "medium" } ], "fields_not_found": [ "ga_date" ], "source_confidence": "high", "last_verified_at": "2026-06-06T00:00:00.000Z" }