Setting up email with Sendgrid

Generate the user mailer class

rails generate mailer UserMailer

Define the method for sending emails

class UserMailer < ActionMailer::Base
  include SendGrid
  sendgrid_category :use_subject_lines
  sendgrid_enable   :ganalytics, :opentrack

  def send_email(message, email)
    @message = message
    mail to: email, subject: 'Your subject here'
  end
end

Generate the view for the method in views/user_mailer/send_email.html.haml

%p
  = @message

Set up each config/environment/ENVIRONMENT.rb file with the following

config.action_mailer.default_url_options = { host: ENV['ENVIRONMENT_URL'] }
config.action_mailer.raise_delivery_errors = true

Set up config/application.rb

  ActionMailer::Base.smtp_settings = {
    address: 'smtp.sendgrid.net',
    port: 25,
    domain: 'www.YOURDOMAIN.com',
    authentication: :plain,
    user_name: ENV['SENGRID_USERNAME'],
    password: ENV['SENGRID_PASSWORD']
  }
  config.action_mailer.default_options = {
    from: '[email protected]'
  }

Send your email where needed

UserMailer.send_email(message, email).deliver

jpbalarini/sendgrid_send_email.md