config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = { address:              'smtp.sendgrid.net',
                                     port:                 587,
                                     domain:               'yourdomain.com',
                                     user_name:            'someuser',
                                     password:             'somepassword',
                                     authentication:       'plain',
                                     enable_starttls_auto: true }