} >>> [log in to unmask] 1/5/2007 9:22:15 AM >>>

} discussions with LSOFT). These probes were the reason subscribers were
} getting auto-deleted due to their vacation messages. The probe would
} keep getting sent out everyday and the vacation message was sending a
} bounce back and ultimately auto-deleting the subscriber.

Your users have a broken, or perhaps just very poorly designed vacation
program.  The better ones will:

* Keep track of who they have replied to and wait a user specified
  number of days before answering that originator again.

* Maintain a list of addresses not to be responded to.

* Detect that an incoming mail is from a list and not respond.

* etc etc

Can you look into getting a better one?