From: (Alan Brown)
Subject: Re: SPAM: new crapware technique - what use other than confusion?
Date: Sun, 20 Oct 2002 15:30:00 +0000 (UTC)

On Sun, 20 Oct 2002, Bert Driehuis wrote:

> I see it in three variations (two of which are old, the third only
> popped up last week):
>
>  HELO my-mx.example.com  [My MX's MX data]
>  HELO example.com [The bit after the @ in the victims e-mail address]
>  HELO 1.2.3.4   [my MX's IP address]
>
> I refuse them with "I refuse to talk to myself". Side note to Postfix
> users: use a PCRE map for this, not an access map :-)

There are at least 3 pieces of MS dai  bramage which HELO as the machine
that they`re talking to, instead of their own name.

Refusing them is probably a good idea, but be preperaed for possible
complaints form genuine users about rejected mail.

Then again, all 3 packages also rewrite refusal texts with their own
interpretation in the message actually returned to the end user, so they
may not even be aware you`re refusing their mail (usually it ends up
being rewritten to "user unknown")