--On 1 November 2006 23:42:43 -0800 Greg Wiley <greg@???> wrote:
> Marc Perkel wrote:
> > What are the rules for HELO?
>
> One thing that bit us a couple of years
> ago was checking for strict domain
> format compliance. Some Exchange boxes
> will include a "_" in their HELO's. I
> think it's because Exchange uses the
> Windows computer name in a HELO. Under-
> scores are perfectly legal characters for
> Windows host names but not for DNS
> domains. So we add:
>
> helo_allow_chars = _
>
> to allow connections from those folks.
>
> -dub
We don't allow those folks to send mail. Last complaint was a few years
ago, we advised them how to fix the problem, and I presume they did.
--
Ian Eiloart
IT Services, University of Sussex
