>RFC821 says (in 4.3):
> Note: all the greeting type replies have the official name of
> the server host as the first word following the reply code.
>
>220 X1 NT-ESMTP Server imail.ipswitch.com (IMail 6.06 103590-1)
> ^^
<G> I've wondered about that one. I often have to explain it to people who run my
DNS Report ( http://www.declude.com/tools ), which brings up a warning message for
anyone using IMail.
As far as I know, there are no known problems with the X1 being there. However, there
was one person who was implementing some sort of spam control system that would use
that host name. I think the idea was to match it to the MX record or some sort of
thing like that. But, there are tons of misconfigured mail servers that stuff there
other than a fully qualified domain name.
--
-Scott
Declude: Anti-virus and Anti-spam solutions for IMail. http://www.declude.com
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