Trying to receive emails with ActionMailer + Postfix

I've been having a world of issues with trying to get ActionMailer
(using Rails 3.0 beta 2) to receive emails from Postfix.

Currently in Postfix's aliases file I have the line:
rails_mailer: | "/home/directory/to/app/script/rails runner
'MailReceive.recieve(STDIN.read)'"

And in my Mailer that should be receiving it I have a method defined as
such:

def receive (email)
...
...
end

However when I send an email to the server and try to manipulate the
email object (for instance comparing email.to against another string) it
tells me it cannot convert from nil to String. I don't think it's
receiving the email properly but I'm not sure what's failing with the
email forwarding.

Any help would be greatly appreciated.