IIS 6 SMTP uses <> as the envelope sender for DSNs.
2005-02-27 21:39:21 184.108.40.206 OutboundConnectionCommand MAIL FROM:<> 0
I'm not sure why it's changing to postmaster for you. Now, the from header in
an MS DSN says, "From: postmaster(_at_)helo".
It would not be wise to reject mail from postmaster addresses. This is the
address I would expect people to contact me with and also the address I would
reply from. This is also the address I would use when contacting other
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