ActiveCampaign email API: SDKs, docs and limits (2026)

From ActiveCampaign's official docs · checked 10 September 2026

Docs, SDKs and limits

Developer docs

developers.activecampaign.com/

API reference

developers.activecampaign.com/reference/overview

Webhooks

Webhook docs

Pricing page

www.activecampaign.com/pricing

From our feature matrix — documented by the vendor

API, SMTP and sending auth

• ✓APIAPI on all plans — 'Getting started with the API' tagged Starter/Plus/Pro/Enterprise, needs only a valid account
• ×SDKs / client librariesPer ZoomInfo Pipeline (Aug 2026): 'ActiveCampaign does not publish official SDKs in any language.' Vendor API overview mentions only a Postman collection
• ✓Public API docs'comprehensive API documentation to help you build custom integrations'
• ✓Webhooks'Webhooks provide the ability to receive real-time data updates about your contact & campaign activity' — 30+ event types; triggered by contact, user, system or API
• ◐SMTP APISMTP and API sending only through Postmark (ActiveCampaign-owned, separate account/pricing); ActiveCampaign API v3 docs point to Postmark for email API use cases
• ◐SMTP relayVia Postmark ('Made with love at ActiveCampaign'), which supports SMTP and API but runs as a separate account/pricing from the marketing platform
• ✓Transactional email'Transactional Email: Powered by Postmark' (add-on product)
• ✓SPF assistance'Configure Domain' option sets up DKIM, DMARC and SPF for you; manual walkthrough alternative
• ✓DKIM setupAutomatic or guided DKIM setup when adding a sending domain
• ✓DMARC supportDMARC setup + troubleshooting docs; free domain test with 'detailed report on your DMARC, SPF, and DKIM configurations'

Features checked 10 September 2026. ✓ documented · ◐ limited or plan-gated · × documented as absent · — not documented. Documentation is not a measured result — see our methodology.

Pricing snapshot

Generated from our datasets — every value verified and dated

Frequently asked questions