[vps-mail] imanager vacation reply - why "Postmaster notify" if undeliverable?

["Ken Douglass" <ken-pt@xxxxxxxxxxxxxxxx>]

A client turns on his imanager vacation reply and I get flooded with mail
addressed to postmaster with the original nessage sent as well as a
"details.txt" file regarding "recipient address rejected."

1) Don't you think these notices will always be useless when they are the
result of a vacation responder?

2) Is there a way to prevent these notices from being generated? 

In the mean time,I see a header:
     X-autoreply: uid 1011 at myserver.com
   ...which I'll try to catch with Procmail

Thanks, Ken

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