[Mimedefang] Where is best to use $SendmailMacros{"auth_authen"} ?

[Ben Kamen]

Where would I be best putting a check for $SendmailMacros{"auth_authen"}
to see if someone relaying has auth'd?

And what action would I use? Just action_accept()?

I don't want to do anything to the email - I want MIMEdefang to just "get out of 
the way"... heheh.. waste no more time!

Thanks,

  -Ben