如何用devise gem发送邮件？

gem 'devise'

rails generate devise:install
rails generate devise MODEL_NAME

devise :confirmable, :omniauthable, :recoverable, :registerable, :rememberable, :trackable, :validatable

config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
  address: 'smtp.exmail.qq.com',
  port: 465,
  domain: 'your-domain.com',
  user_name: 'your-email@your-domain.com',
  password: 'your-password',
  authentication: :login,
  enable_starttls_auto: true,
  ssl: true
}

after_create :send_confirmation_instructions
def send_confirmation_instructions
  Devise::Mailer.confirmation_instructions(self).deliver_now
end

def send_reset_password_instructions
  Devise::Mailer.reset_password_instructions(self).deliver_now
end