instance MS Exchange 2000 servers and below all respond 250 if the domain is
valid and accept the mail, they may well bounce it later but if they manage
that domain, they will accept anything sent to it initially. I know Exchange
2003 operates differently if you want it to in that it will only accept mail
for the defined mailboxes if you set it up that way. As for other mail
servers, I think how this is implemented is totally dependent on how the
developers interpreted the relevant RFC documentation.
Paul
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