Sending Devise emails via Sidekiq (or any other job scheduler)

# File: user.rb
class User
 # …
 # Devise overrides
 def send_on_create_confirmation_instructions
 Devise::Mailer.delay_for(1.day).confirmation_instructions(self)
 end

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

 def send_unlock_instructions
 Devise::Mailer.delay.unlock_instructions(self)
 end
end