paranoid ar_mailer


I am using ar_,ailer and I love it. I am wondering though. Is there a way that it can be configured to not delete the emails, but rather just mark them as sent.
We have a backgroundrb process that will be sending out notifications. If the server dies while in the process of sending them out it and backgroundrb starts up again, it could happen that it starts sending out notifications that have already been sent.

I can log the last time that a user was notified and check that before sending emails, but I was wondering if this functionality exists in ar_mailer so that the backgroundrb process can just check if the mail it wants to send exists in the emails table before sending it.

Why are there so few posts etc. about ar_mailer out there?