Rails: SendGrid settings

Rails: SendGrid initializer

# config/initializers/sendgrid.rb
ActionMailer::Base.smtp_settings = {
  :user_name => ENV['SENDGRID_USER'],
  :password => ENV['SENDGRID_PASSWORD'],
  :domain => 'herokuapp.com',
  :address => 'smtp.sendgrid.net',
  :port => 587,
  :authentication => :plain,
  :enable_starttls_auto => true
}

# for use with Devise
ActionMailer::Base.default_url_options[:host] = "localhost:3000" unless Rails.env.production?