Annoying messages after posting to unix-wizards

[utzoo!decvax!watmath!bstempleton]

As anybody who has posted to unix-wizards probably knows, there are some
people on the arpanet side who can not get mail delivered to them.  This
means that for every message posted to the group, a response is coming back
saying mail could not be delivered.  Could something be done about stopping
this message from coming back, at least to the USENET?