Zoho Campaigns email API: SDKs, docs and limits (2026)

From Zoho Campaigns's official docs · checked 10 September 2026

Docs, SDKs and limits

Developer docs

www.zoho.com/campaigns/help/developers/

Pricing page

www.zoho.com/campaigns/pricing.html

From our feature matrix — documented by the vendor

API, SMTP and sending auth

• ✓API'Developer API' (campaign management, list management, callback URLs) on all plans incl Free
• —SDKs / client librariesnot documented in zoho.com/campaigns/help/developers/; Zoho GitHub SDKs found are for Zoho CRM only — searched 2026-09-10
• ✓Public API docsPublic Developer Guide: 'Zoho Campaigns provides APIs to access data to and from other Zoho applications such as Zoho CRM and third-party applications' (OAuth 2.0, v1.1)
• ✓WebhooksCallback URLs included in Developer API on all plans
• —SMTP APInot documented in zoho.com/campaigns/help/developers/ (API overview covers campaign/list management only) — searched 2026-09-10
• —SMTP relaynot documented in zoho.com/campaigns/features.html, developer API overview or email-deliverability page (SMTP relay is a ZeptoMail feature) — searched 2026-09-10
• —Transactional emailnot documented for Zoho Campaigns itself in zoho.com/campaigns/features.html or zoho.com/campaigns/help/developers/ (Zoho routes transactional mail to the separate ZeptoMail product) — searched 2026-09-10
• ✓SPF assistance'How to setup SPF and DKIM TXT records for your domain' help doc
• ✓DKIM setupSPF/DKIM TXT record setup docs; unauthenticated sends may bounce
• ✓DMARC support'What is DMARC' doc in domain-authentication techniques section; SPF/DKIM alignment-failure doc

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