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

I bet there isn't one in 1000 system admins that know that underscores
aren't allowed in HELOs. That's not technical incompetents - it's just a
stupid rule.

Chris Edwards wrote:

>On Thu, 16 Dec 2004, Tony Finch 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, lack of technical competence can indicate a remote system likely
>to be exploitable.
>
>If someone can't setup DNS properly, or get their HELO right, then it's
>reasonable to conclude their security will be lacking too and the spammers
>will find a way to abuse it.
>
>We generally use this sort of thing as filter-fodder, rather than grounds
>for outright rejection.
>
>
>--
>Chris Edwards, Glasgow University Computing Service
>
>
>