On Thursday, March 8 at 10:44 AM, quoth Feizhou:
Just issue a help command during the smtp session. That will answer
the question :)
Not entirely. For the record, Yahoo's server's respond to the HELP
command with this:
250 Okay. Yahoo! MTA
But, on the other hand, that string is just a single line of qmail
(line 72 of qmail-smtpd.c): very easy to change. If I was interested
in obfuscating what server I was using, that's a simple cosmetic
change. What makes one think that it's possible that it's an
obfuscated qmail is the other similarities that it has to qmail. For
example, it's response to EHLO is the same as qmail with the SIZE
patch (sendmail, for example, usually has a lot more to say, and in
different orders). Which could mean that they just happened to
implement theirs the same way, or could mean that it's qmail with a
different HELP response.
If you want a slightly better idea, you have to look for something
that's a bit more of a pain to change, like 8BITMIME support. If it is
important to someone that it be correct, it seems more likely that
they would either use someone else's server or write their own. But,
if it's incorrect in the same way that qmail's is incorrect, it's
rather unlikely that it's a different server.
~Kyle
--
Asking whether machines can think is like asking whether submarines
can swim.
-- Unknown
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