> >
> > I grant you that a lot of improperly configured mail servers will
create
> > such bounce back. However, a properly configured mail server won't
> > accept that email in the first place. It will get a message back to
the
> > connecting "server" indicating "unknown email address" or whatever,
> > rather than accept the message and end up having to reply back to a
> > potentially forged return address.
> >
> Unfortunately, it's not that easy. There are two (somewhat) legitimate
> reasons why many mail servers are configured the way you describe as
> "improperly configured".
> 
> One is that the mail server may be Microsoft Exchange. Exchange will
> always accept emails to the locally hosted domain, and only at a later
> stage of processing determine whether it is deliverable or not. It may
> well be a misfeature of Exchange, but given how popular it is as a
mail
> server, it's hard to argue that they are all "improperly configured".
> 

You are speaking of Exchange 2000. Exchange 2003 has no such limitation.

James

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