Best integration platform for mail and calendar integrations (2026)

Building email and calendar API integrations involves managing OAuth, incremental syncs, and push notifications across providers like Google, Microsoft, and IMAP, highlighting the complexity of integrating these services. The text discusses various platforms for mail and calendar integrations in 2026, evaluating them based on provider coverage, integration building support, API accessibility, authentication ownership, and additional integration capabilities beyond mail and calendar. Nango is highlighted as a versatile platform enabling coding agents to build integrations with full API access, while Nylas offers a unified API for communications data but with limitations. Aurinko provides a pass-through option with minimal data storage, and Unipile focuses on messaging channels like LinkedIn and WhatsApp, with added email and calendar support. The text emphasizes the preference for platforms like Nango, which offer broader integration capabilities and coding agent support, making them suitable for teams expecting to expand beyond basic communications APIs.