Got any RFCs to back that up? :)
In this case, the server definitely is reachable.
if there is not intelligible SMTP dialog, it's "SMTP unreachable".
Hmmm... I searched the RFCs for 'if there is not intelligible SMTP dialog, it's "SMTP unreachable".', but there aren't any that contain that. :)
Rod did point out that RFC2821 does cover this situation (it is a "connection reset", as a TCP 'RST' is sent), but as he pointed out, it could probably be interpreted either way (since the connection is reset before the connection is fully established).
In any case, since an MX record is supposed to list mailservers that accept mail for a domain, the "burden of proof" really should belong to the person who decided it would be cool to waste resources and have a non-existent mailserver as their primary mailserver.
-Scott
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