mperham--sidekiq/myapp/app/mailers/user_mailer.rb

class UserMailer < ActionMailer::Base
  default from: "sidekiq@example.com"

  def greetings(now)
    @now = now
    @hostname = `hostname`.strip
    mail(to: "mperham@gmail.com", subject: "Ahoy Matey!")
  end
end