[Mimedefang] filter-relay, rejection on bogus helo

[Joseph Brennan]

> So just skip that check for local IPs:
>
>   if($hostip !~ /^128\.59\./){
>     # do HELO checks here
>   }

We have no reason to trust local IPs more than other IPs, and
our users may be sending from other networks.  What we may do later
is reject bad HELO if not smtp auth'd.

Giving a spam score for bad HELO might have possibilities.
We haven't tried that.

Joseph Brennan         Columbia University in the City of New York
Academic Technologies Group                   brennan at columbia.edu