prevent routing of mail messages

[Lou Kates]

On a UNIX  machine  (386ix System V)   how can one cause all mail
being routed  out through a particular host  from being  bounced.
That is, if my  machine is A, it is desired to have have all mail
coming into A and being routed  out of A and into another machine
via neighbouring  machine B to be bounced. If it is coming into A
being  routed out  of   A  into another machine via  neighbouring
machine C then it should not be bounced. Mail  originating from A
would not be bounced at all.

Lou Kates, Teleride Sage Ltd., tslwat!louk at watmath.waterloo.edu
416-596-1940 ext. 210