Re: [exim] syntactically invalid argument(s) - rejected HELO

In this case the server was auction.co.kr which is probably not a
trivial server. I think that exim rejecting an underscore in the HELO is
a bug and something that shouldn't happen by default even if it is
technically not supposed to be there.

Tony Finch wrote:

>On Thu, 16 Dec 2004, Alan J. Flavell wrote:
>
>
>
>I don't think there's much point in trying to fix the world :-)
>
>People have tried to use technical competence as an anti-spam technique,
>but it doesn't work because legitimate email senders are generally less
>clueful than the spammers. However spammers do stupid things which allow
>you to systematically identify some of their messages using technical
>features. A double dot in a HELO name (which Exim's built-in syntax check
>doesn't detect) or a very long HELO name are both very reliable indicators
>of abusive behaviour. This kind of signature might be technical
>incompetence (double dot) or it might just be abuse (excessive length) but
>the point of the check is that it's spammer-only behaviour, and doesn't
>overlap with the fumblings of idiots.
>
>Tony.
>
>