Nylas

API

API for reading and sending email, calendar and contacts across providers

Price: Free tier, then paid
Access: API key and grant ID

About

One REST API for email, calendar and contacts across Gmail, Microsoft 365, Yahoo, iCloud and IMAP accounts. Each user connects their mailbox through OAuth, and your app acts on it with a grant ID. Provider limits such as Gmail's 2,000 sends per day still apply.

What you can do with it

Read and search messages in a user's Gmail, Outlook or IMAP inbox
Send email and replies from a user's own connected account
Create calendar events and check availability across providers

Get started

Create an app and API key in the Nylas Dashboard
Connect a test mailbox to get a grant ID

Example

curl "https://api.us.nylas.com/v3/grants/$NYLAS_GRANT_ID/messages?limit=10&unread=true" \
  -H "Authorization: Bearer $NYLAS_API_KEY"

Details

Hosting: Hosted service
Available in: Worldwide
Official SDKs: JavaScript/TypeScript, Python, Ruby, Java, Kotlin
MCP server: Remote
Works with: Gmail, Outlook, Google Calendar