huginn/config/initializers/action_mailer.rb

# Read smtp config out of a config/smtp.yml file

smtp_config = YAML::load(ERB.new(File.read(Rails.root.join('config', 'smtp.yml'))).result)
if smtp_config.keys.include? Rails.env
  Huginn::Application.config.action_mailer.smtp_settings = smtp_config[Rails.env].symbolize_keys
end

# Huginn::Application.config.action_mailer.smtp_settings = {
#   address: ENV['SMTP_SERVER'] || 'smtp.gmail.com',
#   port: ENV['SMTP_PORT'] || 587,
#   domain: ENV['SMTP_DOMAIN'],
#   authentication: ENV['SMTP_AUTHENTICATION'] || 'plain',
#   enable_starttls_auto: ENV['SMTP_ENABLE_STARTTLS_AUTO'] == 'true' ? true : false,
#   user_name: ENV['SMTP_USER_NAME'],
#   password: ENV['SMTP_PASSWORD']
# }