[Mimedefang] DNSBL not working on Solaris 8

[Thomas Jackson]

This was on the wrong list, sorry.  Answer was Perl Net::DNS.  Oddly
enough reading the release notes for the beta of MD 2.45 gave me the idea
for the fix.

> Running MD 2.43 and SA 2.63.  The same exact mimedefang-filter and
> sa-mimedefang.cf on a linux and solaris box result in two different spam
> scores.  The linux system appears to be doing the DNSBL checks while the
> Sol system isn't.  Is there a known problem with Solaris?  Has anyone
> else seen this?