ar_sendmail in daemon mode - on ubuntu


I am thinking of using ar_mailer as emailing solution for my app. But
unfortunately, i am not able to run it in daemon mode.

if i start the ar_sendmail as: $ar_sendmail -d
It simply bails out without any error after a while, but it doesn't
serve any emails.

Whereas as vanilla $ar_sendmail does send out mails.
What is the issue with daemon mode. I did see few others struggling with
it, but no solution has been posted.

Please do suggest.