[Mimedefang] Do not use Clam AV < version 8.0

[James Curtis]

If anyone is using Clam A/V version less than version 8.0, you need to read
this
http://sourceforge.net/forum/forum.php?thread_id=1174326&forum_id=420492
They are going to start blacklisting anyone from updating their A/V database
if they are using older
versions of the software.  They are also requiring a freshclam.conf
modification that is disabled
by default.

Thought the community should know, I just happened to check their site
tonight.

James William (Bill) Curtis