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This README is for the Nylas Ruby SDK version 4. For those who are still using Nylas Ruby SDK Version 3, the documentation and source code is located in the 3.X-master branch. For those upgrading from 3.X to 4.0, review the upgrade guide


Add this line to your application's Gemfile:

gem 'nylas'

And then execute:


You don't need to use this repo unless you're planning to modify the gem. If you just want to use the Nylas SDK with Ruby bindings, you should run:

gem install nylas

MacOS 10.11 (El Capitan) note

Apple stopped bundling openssl with MacOS 10.11. However, one of the dependencies of this gem (EventMachine) requires it. If you're on El Capitan and are unable to install the gem, try running the following commands in a terminal:

sudo brew install openssl
sudo brew link openssl --force
gem install nylas


  • Ruby 2.2.2 or above.
  • rest-client, json, yajl-ruby, em-http-request

Supported Rails Versions

We support Rails 4.2 and above. A more detailed compatiblity list can be found in our list of Gemfiles


Plain Ruby

The following examples are from examples/plain-ruby.rb

Handling Errors

The Nylas API uses conventional HTTP response codes to indicate success or failure of an API request. The ruby gem raises these as native exceptions.

Code Error Type Description
400 InvalidRequest Your request has invalid parameters.
403 AccessDenied You don't have authorization to access the requested resource or perform the requested action. You may need to re-authenticate the user.
404 ResourceNotFound The requested resource doesn't exist.
500 InternalError There was an internal error with the Nylas server.
502 BadGateway Nylas received an invalid response from the upstream server.

A few additional exceptions are raised by the draft.send! method if your draft couldn't be sent.

Code Error Type Description
402 MessageRejected The message was syntactically valid, but rejected for delivery by the mail server.
422 MailProviderError There was an error with the mail provider when trying to send the message
429 SendingQuotaExceeded The user has exceeded their daily sending quota.
503 ServiceUnavailable There was a temporary error establishing a connection to the user's mail server.

Open-Source Sync Engine

The Nylas Sync Engine is open source, and you can also use the Ruby gem with the open source API. Since the open source API provides no authentication or security, connecting to it is simple. When you instantiate the Nylas object, provide nil for the App ID and App Secret, and set the API Token to the id of the account you're going to access. Finally, don't forget to pass the fully-qualified address to your copy of the sync engine:

require 'nylas'
nylas = Nylas::API.new(api_server: 'http://localhost:5555/')

# Get the id of the first account -- this is the access token we're
# going to use.
 = nylas.accounts.first.id

# Display the body of the first message for the first account
nylas = Nylas::API.new(access_token: , api_server: 'http://localhost:5555/')
puts nylas.messages.first.body



Install RubyGems if you don't have it

gem install bundler
gem update --system


bundle install

You can run tests locally using rspec

rspec spec


Our guidelines for contributing are in CONTRIBUTING.md.


Authentication Setup

Nylas team members can authenticate with the following:

curl -u nylas https://rubygems.org/api/v1/api_key.yaml > ~/.gem/credentials; chmod 0600 ~/.gem/credentials