Delayed Job not logging in Production

I want my delayed job "code" to log in a different log file for business requirements. So I log a custom status in a log called as dj.log. Inside the "serialized" job, I am putting the log statements to log in my file.

Here is how the setup is

Delayed::Worker.destroy_failed_jobs = false
Delayed::Worker.sleep_delay = 60
Delayed::Worker.max_attempts = 10
Delayed::Worker.delay_jobs = !( Rails.env.test? || Rails.env.development? ) #dont use delayed_job in development or test mode

#Delayed_job custom logger
DJ_LOGFILE = File.join(Rails.root, 'log', 'dj.log')

and here is the job that the workers actually do

    people.each {|p| Mailer.mail(1233, p).deliver; sent_to << p.email }                
    Logger.new(DJ_LOGFILE).info("[DELIVERED] All Emails delivered (#{sent_to.join(", ")})")

what could be the problem here ? please help