Path: csiph.com!usenet.pasdenom.info!aioe.org!.POSTED!not-for-mail
From: Mail Man <Mail@Man.com>
Newsgroups: comp.mail.misc
Subject: Re: Would your SMTP server accept -> ehlo MAPI1.0   ???
Date: Sat, 03 Nov 2012 09:56:32 -0400
Organization: Aioe.org NNTP Server
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Mail Man wrote:
 
> And as pointless as it is, my 12-year-old Post.Office SMTP server
> software is correctly terminating the session with a "501 Invalid
> domain syntax" error.

That might explain the some-what common sightings of SMTP connect and
immediate SMTP close entries in my server's log files.  I see maybe a
dozen of those on any given day.

The source might just be trojanized windoze PC's that are being used as
spam relays (zombies) that impliment a half-ass set of SMTP rules and
methods when they send their spam - one of which is the construction of
a malformed (non-compliant) HELO/EHLO greeting.

So it's probably a good thing that my server is adhering closely to RFC
821.